Developer, developer cartridge, and image forming apparatus
OwnerKenji Koido, Toru Ishiharainventors
Life of this patent
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Abstract
A developer contains a resin material, a colorant, and a lubricant. The ratio of a weight part of the lubricant to a weight part of the colorant is in the range of 0.3 to 10.0. The colorant has a mean particle diameter in the range of 20 to 50 nm and a mean aggregate diameter in the range of 20 to 600 nm. The ratio of the weight of the lubricant to the weight of the colorant may be in the range of 0.5 to 5.0. An image forming apparatus incorporates the developer cartridge that holds the developer.
Claims31
A developer comprised of:
- a resin material;
- a colorant;
- and
- a lubricant;
- wherein a ratio of a weight part of said lubricant to a weight part of said colorant is in the range of 0.3 to 10.0.
A developer comprised of:
- a resin material;
- a colorant;
- and
- a lubricant;
- wherein said colorant has either a mean particle diameter in the range of 20 to 50 nm or a mean aggregate diameter in the range of 20 to 600 nm;
- wherein a ratio of a weight of said lubricant to a weight of said colorant in the range of 0.5 to 5.0.
A developer comprised of:
- a resin material;
- a colorant;
- and
- a lubricant;
- wherein said colorant has a mean particle diameter in the range of 40 to 80 nm and a mean aggregate diameter in the range of 40 to 800 nm;
- wherein a ratio of a weight part of said lubricant to a weight part of said colorant is in the range of 0.3 to 10.0.
A developer comprised of:
- a resin material;
- a colorant;
- and
- a lubricant;
- wherein said colorant has a mean particle diameter in the range of 80 to 180 nm and a mean aggregate diameter in the range of 80 to 1000 nm;
- wherein a ratio of a weight of said lubricant to a weight part of said colorant is in the range of 0.3 to 4.0.
A developer comprised of:
- a resin material;
- a colorant;
- and
- a lubricant;
- wherein said colorant is obtained by blending two types of pigments that are different in mean particle diameter and mean aggregate diameter.
An image forming apparatus comprising:
- an image bearing body;
- a charging unit that charges said image bearing body;
- an exposing unit that forms an electrostatic latent image on said image bearing body charged by said charging unit;
- a developing unit that develops the electrostatic latent image with a developer into a visual image;
- a transferring unit that transfers the visual image onto a print medium;
- and
- a cleaning member in contact with said image bearing body to remove the developer remaining on said image bearing body after the visual image has been transferred onto the print medium;
- wherein said cleaning member is pressed against said image bearing body under a line pressure in the range of 0.3 to 3.0 gf/mm.
Dependencies are inferred from the claim text.