JPS6358369A - Recorder - Google Patents

Abstract

PURPOSE:To eliminate scattering of toner at the time of image formation and to form a transfer image of good picture quality by using a layer formation member provided with a charge implantation electrode. CONSTITUTION:Toner 5 in a hopper 10 is supplied onto a toner carrier roll 1 by a toner conveyance roll 11. The toner on the carrier roll 1 is controlled into a thin toner layer with uniform thickness by the layer formation member with the charge implantation electrode by using the toner 5 and charged electrostatically and uniformly by a triboelectrification sequence between the formation member 16 and toner 5. The toner which is charged uniformly is given the opposite potential from a power source 15 to form a latent image on the toner layer according to an image signal. The toner layer on the toner carrier roll 1 where the toner latent image is formed is scattered over a transfer form 14 by a power source 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention forms a latent image in accordance with an image signal on a developer thin film formed on a developer carrier by a layer forming member having a charge injection electrode. This invention relates to an electrostatic recording device.

Conventional technology A thin layer of developer is supported on a developer carrier by a layer regulating member, and the developer is transferred to the latent image by bringing it into close proximity to or in contact with the latent image carrier having the latent image, thereby performing development. Types of recording devices are known.

Problems to be Solved by the Invention The inventors of the present invention created a latent image in response to an image signal on a thin layer of developer previously formed on a developer carrier using an ion flow modulation means consisting of an ion source and an aperture element. proposed an electrostatic recording device that forms a An outline of an electrostatic recording device using the ion flow modulating means will be explained with reference to FIG.

Referring to FIG. 6, the toner 5 made of monocomponent toner is supplied onto the toner carrier roll 1 in which the conductive cylinder 2 is provided with the dielectric layer 3, and the toner 5 made of monocomponent toner is transferred to the layer forming member that contacts the toner carrier roll 1. 4, the toner is made into a thin toner layer with a uniform thickness, and is tribo-electrified to a positive or negative value by a tribo-electrification series between the layer-forming member 4 and the toner 5. The toner carrier roll 1 thus carries thereon a thin layer of negatively charged toner. An ion current is supplied from the ion supply source 6 toward the uniformly charged toner thin layer in this way while applying a bias voltage by the bias electrode 7 between the ion supply source 6 and the conductive cylinder 2. The ion flow from the ion supply source is modulated according to the image signal by applying a voltage according to the image signal from the control power source 9 to the ion flow modulating means 8 consisting of a plurality of aperture elements,
The toner latent image is formed in accordance with an image signal by selectively colliding with this modulated toner thin layer.

This recording apparatus has the disadvantage that the ion flow modulating means 8 becomes dirty due to flying toner, which disturbs the ion flow and disturbs the latent image.

The present invention aims to improve the above-mentioned drawbacks.

Means for Solving the Problems The above object of the present invention is achieved by using a layer forming member provided with a charge injection electrode in place of the ion flow modulating means.

The present invention provides a developer carrier carrying a developer thereon;
In a recording apparatus including a charging device that selectively charges the developer in accordance with an image signal and a transfer device that selectively transfers the developer on the developer carrier to a recording medium, the developer charging device is configured to charge the developer. having a layer forming member forming a thin layer;
The layer forming member is characterized in that a microelectrode is provided as a charge injection electrode for selectively charging the developer in accordance with an image signal. (Hereinafter, the layer forming member in the present invention will be referred to as "layer forming member with charge injection electrode") Function The function of the present invention will be explained with reference to FIG. FIG. 5 is a diagram showing the principle of electrostatic recording using the layer forming member with a charge injection electrode according to the present invention. The developer 5 is formed into a thin layer by a layer forming member 16 with a charge injection electrode, and charges corresponding to an image signal are injected by a microelectrode provided at the end of the layer. A latent image is thereby written onto the thin layer of developer material. The developer is then selectively transferred onto the recording medium in correspondence with the latent image.

Embodiment FIG. 1 shows an embodiment of a layer forming member with a charge injection electrode in a recording apparatus according to the present invention, and FIG. 2 shows a line I-I in FIG.
This is a cross-sectional view at . In the layer forming member with charge injection electrodes, two rows of thin columnar electrodes 18 are arranged in the longitudinal direction in the insulating rubber plate 17 . This electrode 1
8 is insulated from 1 by an insulating rubber plate 17, and must have a withstand voltage of 100V or more! Kaname deru. This insulating rubber plate is an electric 1f! Contact electrodes 19, which have a width that allows them to come into contact with electrodes 18, are arranged in the longitudinal direction and are crimped onto a base material 20.

As the material for the columnar electrodes 18, it is preferable to use a conductive rubber made of silicone rubber in which carbon is dispersed, and which has the same abrasion resistance as the insulating rubber plate 17. This allows the insulating rubber plate to be damaged by friction with the developer. This can prevent either the columnar electrode 17 or the columnar electrode 18 from wearing out first and failing to function.

FIG. 3 shows another embodiment of the layer regulating member according to the present invention. In this embodiment, the columnar electrodes 18 are arranged in a line at the terminal end. Therefore, it is possible to prevent the injected charge from rubbing against the insulating rubber 17 and disturbing the image.

FIG. 4 shows an embodiment of a recording apparatus according to the present invention using the above layer forming member. The toner carrier roll 1 has a conductive shaft made of stainless steel and has a volume resistance of 1010Ω.
It has a structure in which dielectric cylinders made of thermosetting phenolic resin with a diameter of 1.5 cm are fitted and bonded together. The toner 5 accommodated in the hopper 10 is supplied onto the toner carrier roll 1 by a toner transport roll 11. The toner on the toner carrier roll 1 is regulated by the charge injection electrode layer forming member 16 and the toner 5 to form a thin toner layer with a uniform thickness of 5 μTrL to 20 μm). The toner 16 and the toner 5 are uniformly charged by a frictional charging series. In this embodiment, the charging potential of the toner layer is -40 to -60V. A potential opposite to that of the toner, which is uniformly charged in accordance with an image signal, is supplied from a power source 15 onto the toner layer from the terminal end of the layer forming member with charge injection electrode to form a latent image.

A back electrode 12 is provided at a distance of 200 μm from the toner carrier roll 1, and while a bias voltage of 900 V is applied between the two by a power source 13, the toner layer on which the toner latent image has been formed on the toner carrier roll 1 is transferred to the transfer paper. Make it fly above 14. In this case, if the toner carrier roll 1 side is positively biased, the toner is transferred to the transfer paper 14 and a positive image is formed. For reversal development, just reverse the direction of the bias power supply 13, and use the same voltage to create a reversal image)
I can do q things.

Effects of the Invention In the present invention, as described above, the layer forming member is provided with a microelectrode as a charge injection electrode for selectively charging the developer according to an image signal, thereby forming a latent image. There is no toner scattering during formation, and a transferred image of good quality is formed.

[Brief explanation of drawings]

FIG. 1 is a perspective view of one embodiment of the layer forming member with a charge injection electrode according to the present invention, and FIG.
FIG. 3 is a perspective view of a third embodiment of the layer forming member with a charge injection electrode of the present invention, and FIG. 4 is a cross sectional view of the layer forming member with a charge injection electrode of the present invention. FIG. 5 is an explanatory diagram for explaining the present invention in detail, and FIG. 6 is a diagram illustrating the principle of an electrostatic recording device using ion flow modulation means. FIG. 1... Toner carrier roll, 2... Conductive cylinder, 3
... Dielectric layer, 4... Layer forming member, 5... Toner, 6... Ion supply source, 7... Bias power supply, 8...
...Ion flow modulation means, 9...Control power source, 10...
Hopper, 11... Toner transport roll, 12... Back electrode, 13... Bias power supply, 14... Transfer paper, 15... Power supply, 16... Layer forming member with charge injection electrode, 17 ... Insulating rubber plate, 18 ... Electrode, 19.
...Contact electrode, 20...Base material. Patent applicant Fuji Xerox Co., Ltd. Agent
Patent attorney Tsuyoshi Horabe 2 et al. 75] Figure %3

Claims (3)

[Claims] (1) A developer carrier that carries a developer thereon, a charging means that selectively charges the developer in accordance with an image signal, and a charging device that selectively charges the developer on the developer carrier to a recording medium. In a recording apparatus including a transfer means for transferring, the developer charging means has a layer forming member forming a thin layer of developer, and selectively charges the developer on the layer forming member in accordance with an image signal. A recording device characterized by being provided with a microelectrode for the purpose of recording. (2) Claim 1, wherein the layer forming member is comprised of a leaf spring member and a soft elastic body provided on the side of the leaf spring member facing the developer carrier. recording device. (3) Claim 1, characterized in that the microelectrode is made of a thin film material that has the same abrasiveness as the elastic body.
Recording device described in section.