# US 6,298,210 B1 · Device for creating a uniform toner layer by electrically charging toner particles

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- Number: US 6,298,210 B1
- Document ID: US6298210B1
- Status: Granted
- Kind: B1
- Application number: 09/250,867
- Filed: 1999-02-16
- Granted: 2001-10-02
- Earliest claimed: 1998-02-14
- Assignees: Heidelberger Druckmaschinen AG
- Inventors: Gerhard Bartscher
- Web page: https://patentgrep.com/patent/US6298210B1

## CPC

- G03G 15/0812: {characterised by the developer regulating means, e.g. structure of doctor blade}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A device for developing an electrostatic latent image located on a movable image carrier, the developing device having a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles, and a rotatably mounted developing roller having a surface for accepting the charged toner particles, includes a device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles; and a method for operating the developing device.

## Claims

### Claim 1

A device for developing an electrostatic latent image located on a movable image carrier, comprising:
a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
a rotatably mounted developing roller having a surface for accepting the charged toner particles; and
a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles, said field-generating device having a strip structure with radial structures.

### Claim 2

A device for developing an electrostatic latent image located on a movable image carrier, comprising:
a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
a rotatable mounted developing roller having a surface for accepting the charged toner particles, the surface of the developing roller having a roughness for creating a homogenous toner particle layer; and
a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles;
said field-generating device having an electrode structure;
said electrode structure of said field-generating device having electrodes disposed in a mutual grid spacing corresponding to the spacing between the surface of the developing roller and said electrode structure.

### Claim 3

A device for developing an electrostatic latent image located on a movable image carrier, comprising:
a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
a rotatably mounted developing roller having a surface for accepting the charred toner particles; and
a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles, said field-generating device having a strip structure disposed diagonally relative to a direction of movement thereof.

### Claim 4

A device for developing an electrostatic latent image located on a movable image carrier, comprising:
a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
a rotatably mounted developing roller having a surface for accepting the charged toner particles;
a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles, said field generating device having an electrode structure; and
a continuous electrode arranged downline of said field-generating device.

### Claim 5

A device for developing an electrostatic latent image located on a movable image carrier, comprising:
a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
a rotatable mounted developing roller having a surface for accepting the charged toner Particles, the surface of the developing roller having a roughness for creating a homogenous toner particle layer; and
a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles;
said field-generating device having a conductor track structure.

### Claim 6

A device for developing an electrostatic latent image located on a movable image carrier, comprising:
a developing device including a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles;
a rotatably mounted developing roller having a surface for accepting the charred toner particles;
a field generating device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles; and
a gap formed with varied size is located between the surface developing roller and said field-generating device;
wherein said gap is smaller at an input of said field-generating device than at an output of said field-generating device.