Development apparatus of latent electrostatic images
AssigneeNEC Corporation
InventorYoshisuke Takekida
Life of this patent
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Abstract
An electrostatic recording system having a drum 1 carrying a positively charged latent image 14, and a negatively charged cylindrical sleeve 10 having depressions 10a or other ink holding means on its outer surface. The sleeve is rotated into a tank 11 holding an electrically conducting ink 12 which is picked up in the depressions. The sleeve and drum are counter-rotating at different velocities and approach a narrow gap at which point the negatively charged ink is attracted to the positively charged image. Thereafter the inked image is transferred to a sheet of paper and the drum is cleaned and discharged.
Claims8
A development apparatus of latent electrostatic images comprising, a drum of photosensitive material on which the latent electrostatic images are formed, a tank for accommodating an electrically conductive liquid developer, and an electrically conductive sleeve disposed rotatably within said tank and having a plurality of depressions formed and arrayed on its outer circumferential surface in a zig-zag matrix, said sleeve being disposed closely adjacent said photo-sensitive drum but spaced therefrom a predetermined distance.
An electrostatic recording system comprising:
- a photo-sensitive drum coated with dielectric material, on its surface,
- a charger for uniformly charging the surface of said photo-sensitive drum;
- an exposure device for exposing the surface of said photo-sensitive drum in order to form a latent electrostatic image thereon;
- a development apparatus including a tank for accommodating an electrically conductive liquid developer, and an electrically conductive sleeve disposed rotatably within said tank and having a plurality of depressions formed and arrayed on its outer circumferential surface in a zig-zag matrix for holding said liquid and disposed a predetermined distance from said photo-sensitive drum, whereby said latent electrostatic image can be developed into a visual image;
- a transfer device for transferring said visual image formed on the surface of said photo-sensitive drum onto a sheet;
- a cleaning device for removing liquid developer remaining on the surface of said photosensitive drum which has finished said transfer process;
- and
- a charge remover for removing electric charge remaining on the surface of said photo-sensitive drum which has finished said transfer process.
A development apparatus of latent electrostatic images comprising:
- a photo-sensitive drum on which the latent electrostatic images are formed;
- a tank for accommodating an electrically conductive liquid developer;
- and
- an electrically conductive sleeve disposed rotatably within said tank and having holding means for said liquid developer formed on its outer circumferential surface, said sleeve being disposed with a predetermined gap retained from said photo-sensitive drum, wherein said holding means is a plurality of bores provided in the outer circumferential wall of said sleeve penetrating through the wall.
A development apparatus of latent electrostatic images comprising:
- a photo-sensitive drum on which the latent electrostatic images are formed
- a tank for accommodating an electrically conductive liquid developer;
- and
- an electrically conductive sleeve disposed rotatably within said tank and having holding means for said liquid developer formed on its outer circumferential surface, said sleeve being disposed with a predetermined gap retained from said photo-sensitive drum, wherein said holding means is a plurality of needle-like fine members studded on the outer circumferential surface of said sleeve.
Dependencies are inferred from the claim text.