Photocopying – Contact printing – Light boxes
Patent
1993-03-05
1995-05-02
Moses, R. L.
Photocopying
Contact printing
Light boxes
118261, G03G 1508
Patent
active
054124581
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a developing apparatus which develops an electrostatic latent image held on an image carrier such as a photosensitive material or a dielectric by a mono-component developer.
2. Description of the Related Art
In electronic photocopying machines, electronic photoprinters, and other electrostatic recording apparatuses, an electrostatic latent image is drawn on an image carrier such as a photosensitive material or a dielectric, that electrostatic latent image is developed electrostatically as a charged toner image by a developer, then the charged toner image is electrostatically transferred to a recording medium such as recording paper, then is fixed on the recording medium by heat, pressure, light, etc.
As a developer used in the development process, in general two-component developers comprised of a toner component (fine particles of a coloring resin) and a magnetic component (fine magnetic carrier) are widely known. A developing apparatus using a two-component developer is provided with a developer holding container, an agitator for agitating the two-component developer in the developer holding container and causing frictional charging between the toner particles and the magnetic carrier, and a magnetic roller for attracting part of the magnetic carrier by magnetic force and forming a magnetic brush, that is, a development roller. Part of the development roller is made to be exposed from the developer holding container and face the image carrier. Toner particles electrostatically deposit on the magnetic brush formed on the circumference of the development roller. By the rotation of the development roller, the toner particles are transported to the region facing the image carrier along with the magnetic brush, that is, the development region, where the electrostatic latent image is developed. In short, the magnetic carrier in the two-component developer is given two functions: the function of causing charging friction of the toner and the function of transporting the toner to the development region.
In such a developing apparatus for a two-component developer, there is the advantage that the transportability of the toner particles, which governs the quality of the developed toner image, that is, the quality of the recorded toner image, is relatively excellent, but to maintain that excellent toner transportability, the ratio of the components of the toner particles and the magnetic carrier has to be maintained within a predetermined range and the magnetic carrier has to be periodically replaced. That is, the toner component is consumed by the development, so the toner component must be suitably resupplied. Also, the magnetic carrier must be replaced when degraded.
Therefore, attention has been focused on a developing apparatus using a mono-component developer comprised of only fine particles of a coloring resin, that is, the toner component, as a developing apparatus which does not require the troublesome maintenance as in the case of a two-component developer. In the case of a mono-component developer, especially a nonmagnetic type mono-component developer, however, how the toner particles are charged and how they are transported to the development region become important issues. This is to say that the quality of the developed toner image, that is, the quality of the recorded toner image, is largely governed by the charging characteristic of the toner component and the transportability of the toner component.
In a conventional developing apparatus using a mono-component developer, as the transporter of the developer for transporting the toner to the development region, use is made of an elastic development roller formed from an electroconductive synthetic rubber material, an electroconductive porous synthetic rubber material, etc. The elastic development roller is placed inside the toner holding container and part of it is exposed from the toner holding container and placed in contact with the image carrier. When the ela
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patent: 4674441 (1987-06-01), Kohyama
patent: 4696255 (1987-09-01), Yano et al.
patent: 5177323 (1993-01-01), Kohyama
Hirose Kazunori
Ikeda Masae
Kamaji Hideki
Nishio Yukio
Fujitsu Limited
Moses R. L.
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