# US 4,873,540 A · Image recording method

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- Number: US 4,873,540 A
- Document ID: US4873540A
- Status: Granted
- Kind: A
- Application number: 07/202,591
- Filed: 1988-06-03
- Granted: 1989-10-10
- Earliest claimed: 1987-04-15
- Assignees: Hitachi Metals, Ltd.
- Inventors: Masumi Asanae; Kimura Fumio
- Web page: https://patentgrep.com/patent/US4873540A

## CPC

- G03G 9/0825: {characterised by their structure; characterised by non-homogenuous distribution of components (microcapsular toners G03G9/093)}
- G03G 9/0823: {Electric parameters}
- G03G 13/09: using magnetic brush
- G03G 15/348: {using a stylus or a multi-styli array}
- G03G 2217/0033: where the toner is held behind a gate electrode array until being released
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A method of forming an image comprising the steps of: (a) arranging a plurality of recording electrodes opposite to a movable recording member having an insulating layer on the surface, thereby forming a recording area between the insulating layer and the recording electrodes; (b) supplying to the recording area magnetic toner consisting of toner particles composed of a binder resin and magnetic powder, the toner particles being coated with particles made of a conductive material and further coated thereon with particles made of an insulating material so that it has a bulk resistivity of 10.sup.6 .OMEGA..cm or less and a surface resistivity of 10.sup.5 -10.sup.15 .OMEGA..cm; and (c) applying signal voltage corresponding to the image of the recording electrodes, thereby forming a toner image on the surface of the recording member.

## Claims

### Claim 1

A method of forming an image comprising the steps of:
(a) arranging a plurality of recording electrodes opposite to a movable recording member having an insulating layer on the surface, thereby forming a recording area between said insulating layer and said recording electrodes;
(b) supplying to said recording area magnetic toner, said supplying step including the step of selecting magnetic toner consisting of toner particles composed of a binder resin and magnetic powder, said toner particles being coated with particles made of a conductive material and further coated thereon with particles made of an insulating material so that it has a bulk resistivity of 10.sup.6 .OMEGA..cm or less and a resistivity of 10.sup.5 -10.sup.15 .OMEGA..cm; and
(c) applying signal voltage corresponding to said image to said recording electrodes, thereby forming a toner image on the surface of said recording member.

### Claim 2 (depends on 1)

The method of forming an image according to claim 1, wherein said magnetic toner is coated with 0.5-5.0 parts by weight of carbon black and 0.1-1.0 parts by weight of silica per 100 parts by weight of said toner particles.

### Claim 3 (depends on 1)

The method of forming an image according to claim 1 wherein said selecting step includes selecting a magnetic toner having a bulk resistivity of 10.sup.3 10.sup.5 .OMEGA..cm and a surface resistivity of 10.sup.6 10.sup.14 .OMEGA..cm.

### Claim 4 (depends on 3)

The method of forming an image according to claim 3 wherein said selecting step includes selecting a magnetic toner having a surface resistivity of 10.sup.8 10.sup.13 .OMEGA..cm.