Developing device
AssigneeCanon Kabushiki Kaisha
InventorYasuyuki Tamura
Life of this patent
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Abstract
To form an irregularity-free thin layer of developer on a developer supporting member, the surface of the developer supporting member is formed with concavo-convexities along the conveyance direction thereof. To eliminate any irregularity of the developer layer on the developer supporting member and to sufficiently impart charge to the developer by the friction between the developer and the supporting member, the concavo-convexities should preferably have a pitch of 5-100.mu., a concavity depth d of 0.2-10.mu. and a concavity width W of 2d-3d. The concavo-convexities should desirably be rounded rather than sharp.
Claims23
A developing device for developing a latent image on a latent image bearing member by imparting a one-component toner to the latent image, said device comprising:
- means for supplying one-component magnetic toner;
- a member for supporting on its surface toner supplied from said supply means;
- magnetic field generating means disposed within said supporting member;
- and
- a thickness controlling member disposed in proximity to said supporting member for controlling the thickness of a layer of toner formed on the surface of said supporting member;
- wherein said developer supporting member has concavo-convexities on the surface thereof, said concavo-convexities including at least repeating peaks and valleys formed along the direction of movement of the toner, said concavo-convexities having a depth of 0.2-10.mu..
A developing device for developing a latent image on a latent image bearing member by imparting a one-component to the latent image, said device comprising:
- a container for containing one-component magnetic toner therein;
- a sleeve as a toner supporting member rotatably supported by said container;
- a magnet roller as magnetic field generating means fixedly disposed within said sleeve;
- and
- a blade as a thickness controlling member disposed in proximity to said sleeve for controlling the thickness of the toner on the surface of said sleeve;
- wherein said sleeve has concavo-convexities on the surface thereof, said concavo-convexities being formed only by horizontal components connected together in the axial direction of said sleeve, said concavo-convexities having a depth of 0.2-10.mu..
A developing device for developing a latent image on a latent image bearing member by imparting a one-component developer having an average particle size of about 30.mu. or less to the latent image, said device comprising:
- means for supplying one-component developer;
- and
- a developer supporting member for carrying supplied developer on the surface thereof to a developing station where the developer supporting member faces the image bearing member, said developer supporting member having a rough surface formed with numerous concavo-convexities the heights of which are 1/4 to 3 times the average particle size of the one-component developer.
Dependencies are inferred from the claim text.