JPS5998874A - Electrostatic recording head - Google Patents

Abstract

PURPOSE:To attain to stabilize discharge and to prevent the lowering of image quality, by constituting a recording electrode and a control electrode from an aluminum alloy which is improved in processability, corrosion resistance and tensile strength by adding Mg, Cu, Zn or Si to Al. CONSTITUTION:An electrostatic recording head 10 is constituted of a recording electrode 1 comprising an Al-4-8% Mg alloy, control electrodes 2 each made of an Al-4-8% Mg alloy and arranged to the side parts so as to leave predetermined distances from the recording electrode 1, a spacer 3 for arranging the control electrodes 2 and the recording electrode 1 to the upper side from a dielectric layer 4 being a recording body so as to leave predetermined intervals from said dielectric layer 4 and an insulator 7 integrally molding the electrodes 1, 2. Since said electrodes consist of an Al-alloy which is improved in processability, corrosion resistance and tensile strength by mixing Mg, Cu, Zn or Si in Al with low work function, the lowering of image quality can be prevented because of the reduction of dot omission due to discharge stabilization.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic recording head that improves the stability of discharge between a multi-needle electrode and a recording medium (dielectric belt or drum) and improves print quality.

As a conventional electrostatic recording head, for example, there is one in which a recording electrode of a multi-needle electrode array and a control electrode (continuous length or divided into a plurality of pieces) provided corresponding to the recording electrode are integrally molded with an insulator. An electrostatic latent image is formed on the dielectric belt by applying a voltage to the recording electrode according to the recording signal and discharging it through the dielectric belt. The recording electrode is made of nickel with a small amount of copper dissolved in it from the viewpoint of workability, corrosion resistance, etc.

However, nickel has a work function. , e■ expressed in years) is higher (4.84 eV) than other metals, making it difficult for field electron emission to occur. The gap between the belt and the dielectric belt is 51
In the normal operation state of .mu.m, there is a possibility that the dots may be missing without generating discharge, which may deteriorate the image quality.

The present invention has been made in view of the above, and in order to prevent image quality deterioration by reducing dot dropout by stabilizing the discharge, recording electrodes and control electrodes are replaced with AA electrodes having a small work function.
(3,74 eV), Mg, C! u, Zn.

The present invention provides an electrostatic recording head made of an A1 alloy that has improved workability, corrosion resistance, tensile strength, etc. by adding Si or the like.

Hereinafter, the electrostatic recording head according to the present invention will be explained in detail.

FIG. 1 shows an embodiment of the present invention, in which a recording electrode (only one is shown for convenience) 1 made of an Al-4 to 8% Mg alloy having a predetermined diameter, for example, 50 μm, and a predetermined electrode from the recording electrode are shown. Al-4~8%Mg arranged on the sides with intervals
A control electrode 2 made of an alloy, the control electrode 2 and the recording electrode 1
An electrostatic recording head 10 is composed of a spacer 3 for arranging a recording body at a predetermined distance, for example, 1000 m, from a dielectric layer 4, which is a recording body, and an insulator 7 for integrally molding the electrodes 1 and 2. .

The dielectric belt 11 (which can be replaced with a drum) which is placed under the spacer 3 in contact with the spacer 3 has a base Mylar 6 on the underside.
(thickness is, for example, 75 μm), resistive layer 5 (thickness, for example, 20 μm), and dielectric layer 4 (thickness, for example, 5 μm).
m) It is composed of a large number of people.

To explain the operation of the above configuration, when a negative recording voltage according to the recording signal is applied to the recording electrode 1, and a positive voltage of a predetermined value is applied to the control electrode 2, a dielectric belt is applied between the two. A discharge occurs via 11. This discharge generates an electron flow shown by the arrow, thereby forming an electrostatic latent image on the dielectric surface 4. Al-4 to 8W used for recording electrode 1 and control electrode 2
The i%Mg-A1 alloy can be manufactured by conventional methods. As the heat treatment, for example, solution treatment is performed at 430° C. for 24 hours. The resulting product has strength,
It has excellent elongation, good workability, and excellent corrosion resistance.

The reason why 4 to 8% Mg is added to AJ is the result of considering the processability, tensile strength, corrosion resistance, etc. of the electrode material. In other words, when N Mg becomes 4% or less, the elongation decreases to 35%.
% or more, and the tensile strength and yield strength are 20Kg.
/- and below 7/-, and when Mg is 8% or more, the elongation becomes 33% or less, and the tensile strength and yield strength decrease to 30, 4/mJ and 12 h/vr.
It has been confirmed that the value is greater than or equal to a.

Furthermore, it has been confirmed that the desired electrode material can be obtained by adding an appropriate amount of Ou, Zn, Si, etc. to AJ instead of Mg.

FIG. 2 shows an example of a recording device using the electrostatic recording head 10 of the present invention. This is a system that applies an electrostatic charge. A dielectric belt 11, which is a recording material, is formed by providing the above-mentioned dielectric layer 4 on the surface, a resistive layer 5 below the dielectric layer 5, and a pace mylar 6 below the dielectric belt 11, and a static recording material according to the present invention attached to the surface of the recording material belt 116. A roller 1 that drives an electric recording head 10 and a recording belt 11
2, a motor 13 that drives the o-ra 12 e, a developer 14 that attaches toner to the surface of the recording belt 11 according to the surface charge, and a developer 14 that attaches toner to the surface of the recording belt 110 to a recording paper (ordinary A transfer corotron 16 for adhering (transferring) to paper) 15, a cleaner 17 for removing toner adhering to the surface of the belt 11 after the transfer, and removing the charge on the recording belt 11 cleaned by the cleaner 17. It is composed of an erase corotron 18 and a fixing device 20 that fixes prints and images transferred to the recording paper 15. Each of the above devices and the electrostatic recording head 10 are driven by a fan stain +1 receiver 21, a control section 22, and a drive circuit 23 driven by the control section.

In the above configuration, when the drive circuit 23 applies a recording voltage to the recording electrode of the electrostatic recording head 10 in response to a recording signal received by the facsimile machine 21, the motor 13 driven by the control section 22 moves the dielectric belt 11. As it rotates, an electrostatic latent image is formed on its surface. The latent image is developed with toner at the developing section 14 and transferred onto the recording paper 15 at the transfer section 16. The transferred toner image is fixed by a fixing device 20 to obtain a recorded image, and after residual toner is removed from the dielectric belt 11 by a cleaner 17, the latent image is erased by an erase corotron 18.

In the above embodiment, the gap f with the dielectric belt 11 is
When 5 μm, the potential difference between the recording electrode and the control electrode is 6
00? No missing dots occurred even when the temperature was reduced to the default.

As explained above, according to the electrostatic recording head according to the present invention, the recording electrode and the control electrode are made of Al having a small work function mixed with Mg, Ou, Zn, St, etc. to improve workability, corrosion resistance,
Since it is made of A1 alloy with improved tensile strength, etc., deterioration in image quality can be prevented by reducing dot dropout due to stabilization of discharge.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention. FIG. 2 is a configuration diagram showing an example of a recording apparatus using the electrostatic recording head of the present invention. Explanation of symbols 1... Recording electrode, 2... Control electrode, 3...
・Spacer, 4... Dielectric layer, 5... Conductive layer,
6... Pace Mylar, 10... Electrostatic recording head, 11... Recording belt

Claims (1)

[Scope of Claims] A recording electrode of a multi-needle electrode array and a control electrode corresponding to the recording electrode are provided, and a voltage corresponding to recorded information is applied to the recording electrode to form an electrostatic latent image on a dielectric recording material. In the electrostatic recording head, the recording electrode and the control electrode are made of Al, Mg sOu, Z
0