US 12,242,210 B2
Developing device of a non-magnetic one-component development type capable of suppressing toner melt adhesion to a regulation blade and image forming apparatus including the same
Tomohiro Tamaki, Osaka (JP); and Masahito Ishino, Osaka (JP)
Assigned to KYOCERA Document Solutions Inc., Osaka (JP)
Filed by KYOCERA Document Solutions Inc., Osaka (JP)
Filed on Nov. 6, 2023, as Appl. No. 18/502,844.
Claims priority of application No. 2022-181638 (JP), filed on Nov. 14, 2022; and application No. 2023-049467 (JP), filed on Mar. 27, 2023.
Prior Publication US 2024/0160123 A1, May 16, 2024
Int. Cl. G03G 15/08 (2006.01)
CPC G03G 15/0812 (2013.01) [G03G 15/0818 (2013.01); G03G 2215/0614 (2013.01); G03G 2215/0863 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A developing device that supplies a toner to an image carrying member on which an electrostatic latent image has been formed, the developing device comprising:
a development container for containing a non-magnetic one-component developer composed only of the toner;
a developer carrying member including:
a rotary shaft; and
a roller portion that is stacked on an outer circumferential surface of the rotary shaft and is brought into pressure contact at a prescribed pressing force with the image carrying member,
on an outer circumferential surface of the roller portion, the toner being carried to form a toner layer; and
a regulation blade that contacts the outer circumferential surface of the roller portion so as to regulate a thickness of the toner layer formed on the outer circumferential surface of the roller portion,
wherein
the developer carrying member is manufactured by a polishing method in which the roller portion being rotated about the rotary shaft is contacted by a grindstone so as to be polished,
when a ten-point average roughness in a circumferential direction and a ten-point average roughness in an axial direction of the roller portion are indicated as Rz1 and Rz2, respectively, Rz1/Rz2≤1.5 is satisfied, and
a contact linear pressure of the regulation blade with respect to the roller portion is not less than 15 [N/m] and not more than 40 [N/m], wherein
a contact area ratio of the developer carrying member is defined as a ratio of an area of actual contact between the outer circumferential surface of the roller portion and a plane of a pressing member to an area of a nip between the outer circumferential surface and the plane when made to contact the outer circumferential surface at a linear pressure of 50 [N/m], and the developer carrying member has asperities provided on the outer circumferential surface so that the contact area ratio is not less than 5% and not more than 20%.