Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2000-04-18
2001-09-18
Goodrow, John (Department: 1753)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C106S031430
Reexamination Certificate
active
06291124
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a toner for toner-jetting used in a toner-jet system, wherein the toner from a toner-supporting member is jettingly adhered to a recording medium, such as a paper and the like in a direct manner to form an image while said toner-supporting member and recording medium are maintained in a noncontact state.
2. Description of the Related Art
As an apparatus for copying (printing) images, such as characters, figures and the like, an electrophotographic apparatus has generally been used heretofore. However, there are problems that a size of said apparatus grows larger and a manufacturing cost of said apparatus increases because in said apparatus, a latent image is formed on a surface of an image-supporting member (a photosensitive member), and a formation (development) of the image is carried out by adhering a toner to the latent image formed on the supporting member in order to make the latent image visible, and then the toner image obtained on the supporting member is transferred to the recording medium.
Therefore, a toner-jetting system (a direct recording method) has been proposed, in which a recording medium, such as a paper and the like is conveyed between a recording electrode and a back electrode that are arranged on the opposite side of a toner-supporting member, and a toner is electrostatically charged by impressing a voltage corresponding to an image signal between the recording electrode and the back electrode, and then the toner from the toner-supporting member is jettingly adhered to the recording medium in a direct manner according to a state of the impressed voltage.
However, in such a toner-jetting system wherein the toner passes through manyl holes of the recording electrode at the time of flight of the toner from the toner-supporting member to the recording member, the problem has been arisen that the toner adheres to the recording electrode to clog up the manyl holes of the recording electrode when the toner makes a flight from the toner-supporting member to the recording member.
Besides, such a recording method brings about a problem concerning an image quality of the obtained image. For example, said recording method poses the problems that a phenomenon wherein dots are stretched and distorted toward a moving direction of the paper (a tailing) takes place in case of printing dots, and that a phenomenon wherein the toner particles are scattered between the lines on a texture region of the paper caused by an impact force at the time of impacting the toner particles on the paper as well as a repulsion force between the toner particles (a scattering) occurs in case of printing lines. Moreover, there are a problems that an image density decreases as it is difficult to smoothly adhere the toner on the recording medium and that even if the toner could be adhered on the recording medium, a sharpness of the image decreases as a boundary between the toner region and the texture region of the paper gets broad (obscure) and the boundary cannot clearly be recognized.
Additionally, there is a problem that the abovementioned problems become more seriously when an electrification amount of the toner is relatively high because the apparatus using the toner-jetting system mentioned above shows a marked tendency that an optimum electrification amount of the toner is changed depending on a setting condition of the apparatus.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a toner for toner-jetting having an excellent image quality, which does not bring about the clogging, the trailing, the scattering, the decreases of the sharpness and density of the image and the like even if the electrification of the toner is relatively high.
Another object of the present invention is to provide a toner for toner-jetting having a relatively broad tolerance range of setting conditions of the apparatus.
The present invention related to a toner used in a toner-jetting system wherein the toner is jettingly adhered to a recording medium in a direct manner, the toner having a specific aerated bulk density, a specific distribution of a particle size and/or a specific mean roundness.
REFERENCES:
patent: 4987454 (1991-01-01), Natsuhara et al.
patent: 5139914 (1992-08-01), Tomiyama et al.
patent: 5240803 (1993-08-01), Ota
patent: 5477250 (1995-12-01), Larson
patent: 5759731 (1998-06-01), Hagi et al.
patent: 5885743 (1999-03-01), Takayanagi et al.
Anno Masahiro
Natsuhara Toshiya
Ohno Yasuhiro
Tanino Ken
Burns Doane , Swecker, Mathis LLP
Goodrow John
Minolta Co. , Ltd.
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