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Method of image formation with a screen element and charging means
| Details |
Inventors: Ando, Yujiro; Ohara, Katsunobu;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP); Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Weinblatt; Mayer
Assistant Examiner: Goodrow; John L.
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto Fitzpatrick, Cella, Harper & Scinto
In a method of image formation, a primary electrostatic latent image is formed on a screen having a number of fine openings, the primary electrostatic latent image is used to modulate a flow of ions to thereby form a secondary electrostatic latent image on a recording medium, the secondary electrostatic latent image is developed by the use of a developer, the developed image is transferred to another recording member, the charging polarity of the residual portion of the developer remaining on the recording medium is controlled so that, at a position whereat the recording medium and the screen come close to each other, the residual developer may be subjected to a force directed toward the recording medium by an electric field present between the recording medium and the screen, and thereafter the recording medium is reused. |
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DETAILED DESCRIPTION It is an object of the present invention to present a method of image formation which is carried out with the screen prevented from being contaminated by particles such as toner particles or paper powder present on the recording medium.
It is another object of the present invention to present a method of image formation which is carried out with the screen prevented from being contaminated by a slight quantity of developer such as toner or the like present on an insulated drum a recording medium as described above.
It is still another object of the present invention to sharply increase the number of times the screen modulates ion flows, by preventing the screen from becoming contaminated by the developer.
It is yet still another object of the present invention to enable modulation of ion flows to occur stably for a long time by preventing said contamination.
To achieve these objects, the present invention modulates ion flows with a primary electrostatic latent image formed on the screen to form a secondary electrostatic latent image on the recording medium; develops the secondary latent image by the use of a developer and transfers the developed image to another recording member, thereafter changes the charge of the residual portion of the developer remaining on the recording medium into a charge of such sense that it is subjected to a force directed toward the recording medium, by the electric field between the screen and the recording medium, at a position whereat the screen and the recording medium come close to each other; and thereby charges the residual developer to a polarity of such sense that the developer is subjected to the force directed toward the recording medium, thus rendering the recording medium ready for reuse.
For example, after the image transfer or after the cleaning, the charging polarity of the residual toner remaining on the recording medium is changed into such a polarity that the developer is subjected to a force directed toward the recording medium, by the electric field between the screen and the recording medium
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