Patent US5019871A successfully refreshed from Google Patents.
US5019871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for electrostatically absorbing an image supporting material on an image supporting carrying member based on the kind of material used
Assignee: Canon Inc
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Filing: 1990-08-16
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Granted: 1991-05-28
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Expires: 2010-08-16
Abstract
Abstract An image forming apparatus includes a movable image carrying member, a latent imager for forming a latent image on the image carrying member, a developer for developing the latent image by a toner, a transferrer for transferring a toner image on the image carrying member formed by the developer to an image supporting member at a transfer position, a carrier for carrying the image supporting member and for conveying the image supporting member to the transfer position in order to perform the transfer, and an adsorption device for causing the image supporting member to be electrostatically adsorbed onto the carrier by supplying the image supporting member with electric charges, a detector for detecting a kind of an image supporting member to be adsorbed, and a controller for controlling an electric-charge supply amount by the adsorption device according to the kind of image supporting member detected by the detector.
Inventors
- 👤 Atsushi Takeda
- 👤 Takashi Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:35
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/0105; G03G15/0131; G03G15/14; G03G15/16; G03G15/163; G03G15/1635; G03G15/165; G03G15/1655; G03G2215/00; G03G2215/01; G03G2215/0167; G03G2215/0174; G03G2215/018; G03G2215/16; G03G2215/1647; G03G2215/1657
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
150 words
An image forming apparatus comprising: a movable image carrying member; image forming means for forming an image on said image carrying member; transfer means for transferring said image on the image carrying member formed by said image forming means to an image supporting member at a transfer position; carrying means for carrying said image supporting member and for conveying said image supporting member to said transfer position in order to perform said transfer; adsorption means for causing said image supporting member to be electrostatically adsorbed onto said carrying means by supplying said image supporting member with electric charges, said adsorption means first carrying said image supporting member to said carrying means; detection means for detecting a kind of image supporting member to be adsorbed; and control means for controlling an electric-charge supply amount by said adsorption means according to the kind of image supporting member detected by said detection means.
Claim 2
Dependent Claim
150 words
An image forming apparatus comprising: a movable image carrying member; image forming means for forming an image on said image carrying member; transfer means for transferring said image on the image carrying member formed by said image forming means to an image supporting member at a transfer position; carrying means for carrying said image supporting member and for conveying said image supporting member to said transfer position in order to perform said transfer; adsorption means for causing said image supporting member to be electrostatically adsorbed onto said carrying means by supplying said image supporting member with electric charges, said adsorption means first carrying said image supporting member to said carrying means; detection means for detecting a kind of image supporting member to be adsorbed; and control means for controlling an electric-charge supply amount by said adsorption means according to the kind of image supporting member detected by said detection means.
Claim 3
Dependent Claim
42 words
An image forming apparatus according to claim 1, wherein said adsorption means comprises a first electrode provided a first side where said carrying means carries said image supporting member and a second electrode provided at a side opposite to said first side.
Claim 4
Dependent Claim
28 words
An image forming apparatus according to claim 2, wherein said first electrode comprises a roller contacting said carrying means and wherein said second electrode comprises corona charging means.
Claim 5
Dependent Claim
16 words
An image forming apparatus according to claim 3, wherein said roller comprises a grounded conductive roller.
Claim 6
Dependent Claim
30 words
An image forming apparatus according to claim 3, wherein a voltage having a polarity component opposite to a voltage applied to said corona charging means is applied to said roller.
Claim 7
Dependent Claim
21 words
An image forming apparatus according to claim 3, wherein said control means controls a voltage applied to said corona charging means.
Claim 8
Dependent Claim
19 words
An image forming apparatus according to claim 5, wherein said control means controls the voltage applied to said roller.
Claim 9
Dependent Claim
44 words
An image forming apparatus according to claim 3, wherein said carrying means comprises rings provided at both end portions thereof in its longer direction, a connecting member for connecting said rings, and a sheet member provided in a cut-away portion of said carrying means.
Claim 10
Dependent Claim
31 words
An image forming apparatus according to claim 2, wherein a voltage applied to said second electrode has a polarity identical to a polarity of a voltage applied to said transfer means.
Claim 11
Dependent Claim
31 words
An image forming apparatus according to claim 1, wherein said carrying means comprises a sheet member for carrying the image supporting member, and wherein said sheet member comprises a dielectric sheet.
Claim 12
Dependent Claim
24 words
An image forming apparatus according to claim 1, wherein said detection means detects the optical transmittance or optical reflectivity of said image supporting member.
Claim 13
Dependent Claim
129 words
An image forming apparatus comprising: image forming means for forming an image on an image supporting member at an image forming position; movable carrying means or carrying said image supporting member and for conveying said image supporting member to said image forming position in order to perform said image formation; adsorption means for causing said image supporting member to be adsorbed onto said carrying means, provided at a more upstream side than said image forming position in the direction of movement of said carrying means; detection means for detecting a kind of said image supporting member; and control means for controlling adsorption force between said image supporting member and said carrying means by said adsorption means according to the kind of image supporting member detected by said detection means.
Claim 14
Dependent Claim
129 words
An image forming apparatus comprising: image forming means for forming an image on an image supporting member at an image forming position; movable carrying means or carrying said image supporting member and for conveying said image supporting member to said image forming position in order to perform said image formation; adsorption means for causing said image supporting member to be adsorbed onto said carrying means, provided at a more upstream side than said image forming position in the direction of movement of said carrying means; detection means for detecting a kind of said image supporting member; and control means for controlling adsorption force between said image supporting member and said carrying means by said adsorption means according to the kind of image supporting member detected by said detection means.
Claim 15
Dependent Claim
45 words
An image forming apparatus according to claim 12, wherein said adsorption means electrostatically adsorbs said image supporting member onto said carrying means by supplying said image supporting member with electric charges, and wherein said control means controls an electric-charge supply amount by said adsorption means.
Claim 16
Dependent Claim
43 words
An image forming apparatus according to claim 13, wherein said adsorption means comprises a first electrode provided at a first side where said carrying means carries said image supporting member and a second electrode provided at a side opposite to said first side.
Claim 17
Dependent Claim
28 words
An image forming apparatus according to claim 14, wherein said first electrode comprises a roller contacting said carrying means and wherein said second electrode comprises corona charging means.
Claim 18
Dependent Claim
16 words
An image forming apparatus according to claim 15, wherein said roller comprises a grounded conductive roller.
Claim 19
Dependent Claim
30 words
An image forming apparatus according to claim 15, wherein a voltage having a polarity component opposite to a voltage applied to said corona charging means is applied to said roller.
Claim 20
Dependent Claim
19 words
An image forming apparatus according to claim 17, wherein said control means controls the voltage applied to said roller.
Claim 21
Dependent Claim
21 words
An image forming apparatus according to claim 15, wherein said control means controls the voltage applied to said corona charging means.
Claim 22
Dependent Claim
31 words
An image forming apparatus according to claim 13, wherein said carrying means comprises a sheet member for carrying the image supporting member, and wherein said sheet member comprising a dielectric sheet.
Claim 23
Dependent Claim
24 words
An image forming apparatus according to claim 12, wherein said detection means detects the optical transmittance or optical reflectivity of said image supporting member.
Claim 24
Dependent Claim
168 words
An image forming apparatus comprising: a movable image carrying member; image forming means for forming an image on said image carrying member; transfer means for transferring said image on the image carrying member formed by said image forming means to an image supporting member at a transfer position; carrying means for carrying said image supporting member and for conveying said image supporting member to said transfer position in order to perform said transfer, said carrying means comprises a sheet member for carrying the image supporting member, said sheet member comprising a dielectric sheet; adsorption means for causing said image supporting member to be electrostatically adsorbed onto said carrying means by supplying said image supporting member with electric charges, said adsorption means first carrying said images supporting member to said carrying means; detection means for detecting the relative dielectric constant of said image supporting member; and control means for controlling an electric-charge supply amount by said adsorption means according to the relative dielectric constant detected by said detection means.
Claim 25
Dependent Claim
168 words
An image forming apparatus comprising: a movable image carrying member; image forming means for forming an image on said image carrying member; transfer means for transferring said image on the image carrying member formed by said image forming means to an image supporting member at a transfer position; carrying means for carrying said image supporting member and for conveying said image supporting member to said transfer position in order to perform said transfer, said carrying means comprises a sheet member for carrying the image supporting member, said sheet member comprising a dielectric sheet; adsorption means for causing said image supporting member to be electrostatically adsorbed onto said carrying means by supplying said image supporting member with electric charges, said adsorption means first carrying said images supporting member to said carrying means; detection means for detecting the relative dielectric constant of said image supporting member; and control means for controlling an electric-charge supply amount by said adsorption means according to the relative dielectric constant detected by said detection means.
Claim 26
Dependent Claim
43 words
An image forming apparatus according to claim 22, wherein said adsorption means comprises a first electrode provided at a first side where said carrying means carries said image supporting member and a second electrode provided at a side opposite to said first side.
Claim 27
Dependent Claim
28 words
An image forming apparatus according to claim 23, wherein said first electrode comprises a roller contacting said carrying means and wherein said second electrode comprises corona charging means.
Claim 28
Dependent Claim
16 words
An image forming apparatus according to claim 24, wherein said roller comprises a grounded conductive roller.
Claim 29
Dependent Claim
30 words
An image forming apparatus according to claim 24, wherein a voltage having a polarity component opposite to a voltage applied to said corona charging means is applied to said roller.
Claim 30
Dependent Claim
19 words
An image forming apparatus according to claim 26, wherein said control means controls the voltage applied to said roller.
Claim 31
Dependent Claim
21 words
An image forming apparatus according to claim 24, wherein said control means controls the voltage applied to said corona charging means.
Claim 32
Dependent Claim
31 words
An image forming apparatus according to claim 23, wherein a voltage applied to said second electrode has a polarity identical to a polarity of a voltage applied to said transfer means.
Claim 33
Dependent Claim
44 words
An image forming apparatus according to claim 24, wherein said carrying means comprises rings provided at both end portions thereof in it longer direction, a connecting member for connecting said rings, and a sheet member provided in a cut-away portion of said carrying means.
Claim 34
Dependent Claim
31 words
An image forming apparatus according to claim 22, wherein said carrying means comprises a sheet member for carrying the image supporting member, and wherein said sheet member comprises a dielectric sheet.
Claim 35
Dependent Claim
26 words
An image forming apparatus according to claim 12, or 22, wherein said transfer means transfers a plurality of toner images to the same image supporting member.
Claim 36
Dependent Claim
16 words
An image forming apparatus according to claim 32, wherein said toner images comprises color toner images.
Claim 37
Dependent Claim
24 words
An image forming apparatus according to claim 1, 12 or 22, wherein said carrying means carries said image supporting member only by electrostatic power.
Claim 38
Dependent Claim
31 words
An image forming apparatus according to claim 1 or 22, wherein said adsorption means is provided upstream said transfer position in relation to the direction of movement of said carrying means.
Claim 39
Dependent Claim
30 words
A image forming apparatus according to claim 1, 11, 12, 21 or 22, wherein said detection means detects whether said image supporting member is a paper or a transparent sheet.
Claim 40
Dependent Claim
35 words
An image forming apparatus according to claim 1, 12 or 22, wherein said detection means detects said supporting member type before said image supporting member is adsorbed on said carrying means by said adsorption means.
Claim 41
Dependent Claim
129 words
An image forming apparatus comprising: a movable image carrying member; image forming means for forming an image on said image carrying member; transfer means for transferring an image on the image carrying member formed by said image forming means to an image supporting member at a transfer position; carrying means for carrying said image supporting member and for conveying said image supporting member to said transfer position in order to perform said transfer; adsorption means for causing said image supporting member to be adsorbed onto said carrying means, said adsorption means carrying said image supporting member to said carrying means at first; control means for controlling adsorption force between said image supporting member and said carrying means by said adsorption means according to the kind of image supporting member.
Claim 42
Dependent Claim
129 words
An image forming apparatus comprising: a movable image carrying member; image forming means for forming an image on said image carrying member; transfer means for transferring an image on the image carrying member formed by said image forming means to an image supporting member at a transfer position; carrying means for carrying said image supporting member and for conveying said image supporting member to said transfer position in order to perform said transfer; adsorption means for causing said image supporting member to be adsorbed onto said carrying means, said adsorption means carrying said image supporting member to said carrying means at first; control means for controlling adsorption force between said image supporting member and said carrying means by said adsorption means according to the kind of image supporting member.
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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) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |