JP2009031811A5

JP2009031811A5 -

Info

Publication number: JP2009031811A5
Application number: JP2008253518A
Authority: JP
Filing date: 2008-09-30
Publication date: 2009-09-03
Anticipated expiration: 2026-09-28

Claims

A developing image bearing member on which a latent electrostatic image is formed and a developing bias on a rotatable developing roller that is disposed with a predetermined developing gap with respect to the image bearing member and conveys toner to the image bearing member. At least a developing device that develops the electrostatic latent image with the toner by applying
The developing roller has a predetermined number of first grooves and second grooves formed in a spiral shape inclining in opposite directions with respect to the axial direction,
Applying at least an AC bias to the rotating developing roller to reciprocate the toner in the crest between the first groove and the second groove of the developing roller between the developing roller and the image carrier;
The reciprocating motion moves the toner in the mountain in the circumferential direction of the developing roller to collide with the toner in the first groove and the second groove,
An image forming apparatus, wherein the electrostatic latent image formed on the image carrier is developed by causing toner in the first groove and the second groove to fly by the collision.

A rotatable image carrier on which an electrostatic latent image is formed, a rotatable developing roller disposed at a predetermined development gap with respect to the image carrier and transporting toner to the image carrier; A developing device that develops the electrostatic latent image with the toner by applying at least an AC bias to the developing roller;
The developing roller has a predetermined number of first grooves and second grooves formed in a spiral shape inclining in opposite directions with respect to the axial direction,
At a predetermined position in the axial direction of the developing roller, the circumferential movement distance of the developing roller and the circumferential direction of the toner per unit time in which the toner on the developing roller reciprocates the developing gap once by the application of the AC bias An image forming apparatus, wherein a difference from a moving distance is set to a non-integer multiple of a circumferential distance between the first groove and the second groove.

The image forming apparatus according to claim 1, wherein a peripheral speed of the developing roller and a peripheral speed of the image carrier are different from each other.

When the circumferential movement distance of the toner is larger than the peripheral speed of the developing roller, the AC bias applied to the toner on the developing roller toward the image carrier is applied. 4. The apparatus according to claim 1, wherein when the peripheral speed of the image carrier is smaller than the peripheral speed of the developing roller, the ratio is proportional to the duty ratio. The image forming apparatus according to any one of the above.

The first groove and the second groove are formed symmetrically with respect to the circumferential direction of the developing roller, and the circumferential distance between the first groove and the second groove is the distance between the first groove and the second groove. The distance of the central position in the axial direction of the developing roller between the intersection and the other intersection of the first groove and the second groove adjacent to the intersection in the axial direction of the developing roller. The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus.

6. The image forming apparatus according to claim 1, wherein pitches of the first groove and the second groove in the axial direction of the developing roller are different from each other.

The image forming apparatus according to claim 1, wherein the predetermined number of the first grooves and the second grooves is one or more.

The image forming apparatus according to claim 1, wherein a predetermined number of the first grooves and the second grooves are different from each other.

The said 1st groove | channel and the said 2nd groove | channel are formed in the groove | channel non-formation part formed in the both ends of the said developing roller, The any one of Claim 1 thru | or 8 characterized by the above-mentioned. The image forming apparatus described.

The image forming apparatus according to claim 1, wherein the developing roller is made of metal .

The image forming apparatus according to claim 1, wherein an outer peripheral surface of the developing roller is electrodeposited.

Applying at least an AC bias to the developing roller having a predetermined number of first grooves and second grooves formed in a spiral shape inclined in opposite directions with respect to the axial direction;
Reciprocating between the developing roller and the image carrier by applying the AC bias to the toner in the crest between the first groove and the second groove of the developing roller;
Causing the toner in the mountain to collide with the toner in the first groove and the second groove by the reciprocation;
And a step of developing the electrostatic latent image formed on the image carrier by causing the toner in the first groove and the second groove to fly by the collision .

Forming an electrostatic latent image on the image carrier;
Developing the electrostatic latent image by applying at least an AC bias to a developing roller disposed at a predetermined development gap with respect to the image carrier and transporting toner to the image carrier. Prepared,
The developing roller has a predetermined number of first grooves and second grooves that are formed in a spiral shape inclined in opposite directions with respect to the axial direction, and at a predetermined position in the axial direction of the developing roller, The difference between the circumferential movement distance of the developing roller and the circumferential movement distance of the toner per unit time in which the toner on the developing roller reciprocates once in the development gap by application of an AC bias is the first groove. An image forming method, wherein the distance is set to a non-integer multiple of the circumferential distance from the second groove.