Developing roller

• US 8,007,426 B2
• Filed: 06/29/2005
• Issued: 08/30/2011
• Est. Priority Date: 06/29/2005
• Status: Active Grant

• Current Assignee: Konica Minolta Business Technologies Incorporated (Konica Minolta Inc.)
• Original Assignee: Konica Minolta Business Technologies Incorporated (Konica Minolta Inc.)
• Inventors: Uchino, Satoshi, Shirose, Meizo
• Primary Examiner(s): Omgba; Essama
• Application Number:
  US11/917,249
• Publication Number:
  US 20090035027A1
• Time in Patent Office: 2,253 Days
• Field of Search: 492/48, 492/49, 492/53, 492/56
• US Class Current: 492/56
• CPC Class Codes: G03G 15/0818 characterised by the structure of the donor member, e.g. surface properties
• CPC Class Codes: G03G 2215/0861 Particular composition or materials
• CPC Class Codes: G03G 2215/0863 Manufacturing

Abstract

A developing roller that can form a toner image with high quality includes: a supporting shaft, and at least one resin layer formed on a peripheral face of the supporting shaft, the resin layer containing carbon black in which a number average Feret'"'"'s diameter is in a range from 5 to 300 nm and primary particles account for 5% or more on a number basis, and the carbon black being dispersed in a base resin material thereof.

Claims

1. A developing roller comprising:

a supporting shaft, and

at least one resin layer formed on a peripheral face of the supporting shaft,

the resin layer containing carbon black in which a number average Feret'"'"'s diameter is in a range from 5 to 300 nm and primary particles account for 5% or more on a number basis, and the carbon black being dispersed in a base resin material thereof; and

wherein a surface of the carbon black particle is surface-treated with a phenol-based organic compound having a molecular weight of 50 or more to 1500 or less.

2. The developing roller of claim 1, wherein the resin layer comprises a plurality of resin layers, with at least one of the resin layers having the carbon black dispersed therein.

3. The developing roller of claim 2, wherein the resin layers comprise a base rubber layer formed on the supporting shaft and a surface layer formed on the peripheral side from the base rubber layer.

4. The developing roller of claim 3, wherein the carbon black is dispersed in the base rubber layer.

5. The developing roller of claim 3, wherein the carbon black is dispersed in the surface layer.

6. The developing roller of claim 3, wherein an intermediate layer is formed between the base rubber layer and the surface layer.

7. The developing roller of claim 6, wherein the carbon black is dispersed in the intermediate layer.