Two-component developer, and method and apparatus for forming image using said developer

A developer, two-component technology, applied in the direction of developer, electric recording process using charge pattern, equipment for electric recording process using charge pattern, etc., can solve background contamination, reduce chargeability and other problems, and achieve prevention and background smudge, toner scatter prevention, toner scatter and background smudge prevention

Inactive Publication Date: 2002-05-22
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve this situation, if non-magnetic black pigments such as carbon black are used together, the chargeability will be reduced and background stains will easily occur

Method used

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  • Two-component developer, and method and apparatus for forming image using said developer
  • Two-component developer, and method and apparatus for forming image using said developer
  • Two-component developer, and method and apparatus for forming image using said developer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0169] 25 parts by weight of toner a prepared in Toner Preparation Example 1 was added to 1100 parts by weight of Carrier C1 prepared in Carrier Preparation Example 1, and mixed in a Turbula mixer to obtain a developer.

[0170] Next, put figure 1The developing device shown was incorporated into an imagio MF 200 manufactured by Ricoh Corporation, and an image forming test was performed to evaluate image density, background smear, halftone reproducibility, and image density controllability by the evaluation methods described below. The results are shown in Table 3.

Embodiment 2- Embodiment 19， comparative example 1- comparative example 2

[0172] As in Example 1, the toner and carrier shown in Table 3 were combined to prepare a developer, and the same method as in Example 1 was used for evaluation. The results are shown in Table 3.

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PUM

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Abstract

The present invention relates to a two-component developer, wherein the application of the electrofax, xerography etc used in the copier, printer, fax etc, including at least a magnetic toner (A) and a magnetic carrier (B), the magnetic toner (A) having complex magnetic particles coated with carbon black, and an image forming apparatus and an image forming method are provided, using the two-component developer. This can sufficiently endow the magnetic toner with charge and prevent the magnetic toner scurry to befoul the background and obtain a good image free from a banding dirt.

Description

technical field [0001] The present invention relates to a developer used when electrophotography, electrostatic printing, etc. are applied to copiers, printers, facsimile machines, etc., an image forming method using the developer, and an image forming apparatus thereof. Background technique [0002] Conventionally, as a method of developing an electrostatic latent image using toner, a two-component developing method represented by a magnetic brush developing method (see US Pat. No. 2,874,063 specification) or a one-component developing method are widely known. [0003] In the dry two-component developer used in the two-component development method, the tiny toner particles are held on the surface of the larger carrier particles by the electric attraction generated by the friction between them and the carrier particles. The electric field that forms the electrostatic latent image causes the suction force that adsorbs the toner particles to the latent ima...

Claims

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Application Information

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IPC IPC(8): G03G9/083G03G9/09G03G9/107G03G9/113G03G15/08G03G15/09
CPCG03G9/0837G03G9/1131G03G9/0839G03G9/0904G03G9/1075G03G9/083G03G9/0835G03G9/113G03G9/1139G03G9/0834
Inventor佐佐木文浩岩本康敬松田浩明中井洋志樋口博人朱冰近藤麻衣子
OwnerRICOH KK