Image formation unit and image formation apparatus

An image formation unit comprising:

• a developer storage configured to store developer;
• an image carrier on which an electrostatic latent image is formed;
• a developer carrier facing the image carrier and configured to transfer developer to the electrostatic latent image;
• a developer housing portion located below the developer storage and configured to house the developer from the developer storage;
• a supply port configured to supply the developer in the developer storage into the developer housing portion;
• a developer amount detection member rotatably disposed in the developer housing portion at a position below the supply port;
• and
• protrusions disposed on the developer amount detection member,
• wherein the developer amount detection member is rotatable to convey the developer in a direction where the developer amount detection member extends,
• wherein the protrusions are arranged in parallel with one another on a flat plate and extend from a radial end portion of the flat plate,
• wherein the protrusions are inclined in such a manner as to radially extend toward the rotational axis of the developer amount detection member and extend from a center area toward an end of the developer amount detection member in the axial direction.

An image formation unit comprising:

• a developer storage configured to store developer;
• an image carrier on which an electrostatic latent image is formed;
• a developer carrier facing the image carrier and configured to transfer developer to the electrostatic latent image;
• a developer housing portion located below the developer storage and configured to house the developer from the developer storage;
• a supply port configured to supply the developer in the developer storage into the developer housing portion;
• a rotation member rotatably disposed in the developer housing portion at a position below the supply port, wherein the rotation member is rotatable to convey the developer in a direction where the rotation member extends, wherein the rotation member is formed with a flat plate radially extending with respect to a rotational axis of the rotation member;
• and
• protrusions arranged substantially parallel with one another and extending from a radial end portion of the flat plate,
• wherein the protrusions are inclined in such a manner as to face a center portion of the rotation member in the axial direction of the rotation member, such that a first subset of the protrusions on a first portion of the flat plate are inclined in a first direction with respect to the flat plate and such that a second subset of the protrusions on a second portion of the flat plate are inclined in a second direction with respect to the flat plate, the first direction being different from the second direction.