JP2013238811A5

JP2013238811A5 -

Info

Publication number: JP2013238811A5
Application number: JP2012113304A
Authority: JP
Filing date: 2012-05-17
Publication date: 2015-05-07
Anticipated expiration: 2032-05-17

Description

本発明の請求項１に係る画像形成装置は、外周面に潜像を保持するとともに周方向に回転する像保持部材と、筒状に形成され、現像剤を引き付ける磁力を発生する磁力発生部が内側に配置され、前記像保持部材の外周面と対向配置され、粒径が３０μｍ以下の磁性粒子及び粒径が４μｍ以下の帯電粒子を含む現像剤を外周面に保持し、前記像保持部材と同じ方向に回転するとともに前記像保持部材の潜像を前記帯電粒子で現像する現像剤保持部材と、前記現像剤保持部材の外周面の周方向に間隔をあけて複数形成され、前記現像剤保持部材の軸方向に見た断面形状がＶ字状で、前記周方向におけるピッチが０．４ｍｍ以下であり、前記周方向の１つの開口幅をＡ、前記周方向における隣り合う間隔をＢとして、Ａ／Ｂが１以上である凹溝と、を有する。 An image forming apparatus according to a first aspect of the present invention includes an image holding member that holds a latent image on an outer peripheral surface and rotates in a circumferential direction, and a magnetic force generator that is formed in a cylindrical shape and generates a magnetic force that attracts a developer. A developer disposed on the inner side, disposed opposite to the outer peripheral surface of the image holding member, and containing magnetic particles having a particle size of 30 μm or less and charged particles having a particle size of 4 μm or less on the outer surface; A developer holding member that rotates in the same direction and develops the latent image of the image holding member with the charged particles, and a plurality of the developer holding members are formed at intervals in the circumferential direction of the outer peripheral surface of the developer holding member. The cross-sectional shape seen in the axial direction of the member is V-shaped, the pitch in the circumferential direction is 0.4 mm or less, one opening width in the circumferential direction is A, and the adjacent interval in the circumferential direction is B, A groove having an A / B of 1 or more, Have.

Claims

An image holding member that holds the latent image on the outer peripheral surface and rotates in the circumferential direction;
A magnetic force generating portion that is formed in a cylindrical shape and generates a magnetic force that attracts the developer is disposed on the inner side, and is disposed to face the outer peripheral surface of the image holding member. The magnetic particles have a particle size of 30 μm or less, and the particle size is 4 μm or less. A developer holding member that holds a developer containing charged particles on an outer peripheral surface, rotates in the same direction as the image holding member , and develops a latent image of the image holding member with the charged particles;
The developer holding member is formed with a plurality of intervals in the circumferential direction of the outer peripheral surface, the developer holding member has a V-shaped cross-sectional shape viewed in the axial direction, and the pitch in the circumferential direction is 0.4 mm or less. A groove having one opening width in the circumferential direction as A, and an adjacent interval in the circumferential direction as B, and A / B is 1 or more;
An image forming apparatus.

^2. The image forming apparatus according to claim 1, wherein the plurality of concave grooves have a total cross-sectional area representing an internal capacity as viewed in the axial direction of 1.0 mm ² or less.

The image forming apparatus according to claim ² , wherein the plurality of concave grooves have a total cross-sectional area of 0.5 mm ² or more.