EP0424085A2
Expired / Lapsed
EP
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Image forming system
Assignee: Oki Electric Industry Co Ltd
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Filing: 1990-10-16
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Granted: —
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Expires: 2010-10-16
Abstract
Abstract In an image forming system employing a photosensitive drum (11) on which an electrostatic latent image is formed, and a toner image bearing belt (14) on which a toner image corresponding to the electrostatic latent image is formed by means of a developing device (17), a discharging device (33), such as an AC corona charger, is provided to face the toner image bearing belt superimposed on the photosensitive drum, at a location downstream of the developing area. The surface charges on the toner image bearing member (14) is therefore removed before or when the toner image bearing member separates from the photosensitive drum (11). As a result, the increase of the potential difference across the air layer due to the decrease of the capacitance of the air layer between the toner image bearing member and the photosensitive drum is prevented, and electrical discharge through the air layer, and attendant scattering of the toner image are thereby avoided.
Inventors
- 👤 Shinichi C/O Oki Electric Ind. Co. Ltd. Itoh
- 👤 Hiroaki C/O Oki Electric Ind. Co. Ltd. Sato
- 👤 Masayuki C/O Oki Electric Ind. Co. Lt Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 22:02
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/169; G03G15/04; G03G15/04036; G03G15/04045; G03G15/22; G03G15/226; G03G15/227
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
114 words
An image forming system comprising: an electrostatic latent image bearing member on which an electrostatic latent image is formed; a toner image bearing member which is brought into contact with said electrostatic latent image bearing member to be superimposed therewith; a developing means for developing said electrostatic latent image to form a corresponding toner image on said toner image bearing member while said toner image bearing member is superimposed with said electrostatic latent image bearing member; and a discharging means provided in apposition to said toner image bearing member superimposed on said electrostatic latent image bearing member, and downstream of said developing means, to discharge any surface charges from said toner image bearing member.
Claim 2
Dependent Claim
114 words
An image forming system comprising: an electrostatic latent image bearing member on which an electrostatic latent image is formed; a toner image bearing member which is brought into contact with said electrostatic latent image bearing member to be superimposed therewith; a developing means for developing said electrostatic latent image to form a corresponding toner image on said toner image bearing member while said toner image bearing member is superimposed with said electrostatic latent image bearing member; and a discharging means provided in apposition to said toner image bearing member superimposed on said electrostatic latent image bearing member, and downstream of said developing means, to discharge any surface charges from said toner image bearing member.
Claim 3
Dependent Claim
18 words
An image forming system as set forth in Claim 1, wherein said discharging means is a corona charger.
Claim 4
Dependent Claim
19 words
An image forming system as set forth in Claim 2, wherein said corona charger is an AC corona charger.
Claim 5
Dependent Claim
58 words
An image forming system as set forth in Claim 3, further comprising: an optical discharging means disposed between said corona charger and said developing means to irradiate said electrostatic latent image bearing member through said toner image bearing member; wherein said toner image bearing member is at least partially transparent to the light from said optical discharging means.
Claim 6
Dependent Claim
33 words
An image forming system as set forth in Claim 3, wherein said corona charger is disposed at the location where the toner image bearing member separates from the electrostatic latent image bearing member.
Claim 7
Dependent Claim
95 words
An image forming system as set forth in Claim 1, further comprising: an exposure device for exposing the electrostatic latent image bearing member to a light image through said toner image bearing member; an optical discharging means disposed between said discharging means and said developing means to irradiate said electrostatic latent image bearing member through said toner image bearing member; wherein said discharging means is a corona charger; and said toner image bearing member is at least partially transparent to the light from said optical discharging means and to the light from said exposure device.
Claim 8
Dependent Claim
24 words
Apparatus according to Claim 6, wherein said exposure device is provided to face the photosensitive member without interposition of the toner image bearing belt.
Claim 9
Dependent Claim
138 words
An image forming system as set forth in Claim 1, further comprising: thermal writing means; and charging means; wherein said electrostatic latent image bearing member has a surface moving to pass by said charging means and said exposure means; said charging means uniformly charging the surface of said photosensitive member as it passes by said charging means; said toner image bearing member is a reversible thermosensitive medium which passes by said thermal writing means and then said exposure means; said thermal writing means selectively applying heat to said thermosensitive medium to form a transmittance image represented by different transmittances; and said exposure means exposing the uniformly charged photosensitive member through said thermosensitive medium on which said transmittance image has been formed, to form an electrostatic image on said photosensitive member, said electrostatic image corresponding to said transmittance image.
Claim 10
Dependent Claim
31 words
An image forming system according to Claim 1, further comprising a display section permitting said toner image on said toner image bearing member to be seen from outside of the system.
Claim 11
Dependent Claim
28 words
An image forming system according to Claim 1, wherein said electrostatic latent image bearing member is a photosensitive drum and said toner image bearing member is a belt.
Claim 12
Dependent Claim
80 words
An image forming system comprising an electrostatic image bearing member (11); a toner image bearing member (14) to receive a toner developed image upon being passed over the electrostatic image bearing member and thereafter separated therefrom characterised by means (33) for applying an electrostatic field to the toner developed image such as to tend to reduce disturbance of the toner developed image thereon by the separation of the toner image bearing member (14) from the electrostatic image bearing member (11).
Claim 13
Dependent Claim
80 words
An image forming system comprising an electrostatic image bearing member (11); a toner image bearing member (14) to receive a toner developed image upon being passed over the electrostatic image bearing member and thereafter separated therefrom characterised by means (33) for applying an electrostatic field to the toner developed image such as to tend to reduce disturbance of the toner developed image thereon by the separation of the toner image bearing member (14) from the electrostatic image bearing member (11).
References Cited (Backward Citations)
No citation records indexed.
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