EP0372813A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Image forming apparatus
Assignee: Canon Inc
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Filing: 1989-11-29
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Granted: —
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Expires: 2009-11-29
Abstract
Abstract An image forming apparatus includes a movable image carrying member (1), a latent imager (3) for forming a latent image on the image carrying member, a developer (4) for developing the latent image by a toner, a transferrer (7) for transferring a toner image on the image carrying member formed by the developer to an image supporting member (P) at a transfer position, a carrier (6) for carrying the image supporting member (P) and for conveying the image supporting member to the transfer position in order to perform the transfer, and an adsorption device (19, 20) for causing the image supporting member to be electrostatically adsorbed onto the carrier by supplying the image supporting member with electric charges, a detector (23) for detecting a kind of an image supporting member to be adsorbed, and a controller (24) 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
EP
Data Source
google_patents
Last Synchronized
2026-10-29 14:03
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: 38
Claim 1
Independent Claim
150 words
An image forming apparatus comprising: a movable image carrying member; latent image forming means for forming a latent image on said image carrying member; developing means for developing said latent image by a toner; transfer means for transferring a toner image on the image carrying member formed by said developing 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 image-supporting carrying means by supplying said image supporting member with electric charges; 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; latent image forming means for forming a latent image on said image carrying member; developing means for developing said latent image by a toner; transfer means for transferring a toner image on the image carrying member formed by said developing 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 image-supporting carrying means by supplying said image supporting member with electric charges; 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
44 words
An image forming apparatus according to Claim 1, where in 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 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 for 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 for 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 means 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 comprises 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
167 words
An image forming apparatus comprising: a movable image carrying member; latent image forming means for forming a latent image on said image carrying member; developing means for developing said latent image by a toner; transfer means for transferring a toner image on the image carrying member formed by said developing 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 comprising 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; 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
167 words
An image forming apparatus comprising: a movable image carrying member; latent image forming means for forming a latent image on said image carrying member; developing means for developing said latent image by a toner; transfer means for transferring a toner image on the image carrying member formed by said developing 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 comprising 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; 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 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 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 1 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 comprise color toner images.
Claim 37
Dependent Claim
65 words
An image forming apparatus of the kind in which a sheet on which an image is to be formed is at some stage in the operation of the apparatus carried by a movable support member and held electrostatically on the surface of that support member characterised in that means are provided to vary the electrostatic holding force to suit differing types and/or material of sheet.
Claim 38
Dependent Claim
65 words
An image forming apparatus of the kind in which a sheet on which an image is to be formed is at some stage in the operation of the apparatus carried by a movable support member and held electrostatically on the surface of that support member characterised in that means are provided to vary the electrostatic holding force to suit differing types and/or material of sheet.
References Cited (Backward Citations)
No citation records indexed.
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