JPS59133073A - Electrostatic recording printing head - Google Patents

Abstract

PURPOSE:To make it possible to perform stable discharge in a hardly contaminated state, by closing the discharge gap of a head surface opposed to a recording body by an electron transport member for transporting an electron between a multi-needle electrode and the recording body at the opening part thereof. CONSTITUTION:The discharge gap formed on the head surface opposed to a recording body 1 by a spacer 5 are closed by an anisotropic conductive substance 10 and an air gap 11 of about several mum is formed between the head surface and a multi-needle electrode 3. This anisotropic conductive substance 10 is constituted by embedding a large number of conductive needles 13 in a dielectric body 12 vertically with respect to the surface of the recording body 1. In this mechanism, when negative voltage is applied to the multi-needle electrode 3 corresponding to recording information, the electron 14 generated by corona discharge is impinged to the anisotropic conductive substance 10 and the recording body 1 directly under the needle 13 nearest to the electron 14 is charged through said neelde 13 to form an electrostatic latent imate. As mentioned above, because the head surface becomes flat, a slide friction to the recording body is reduced and the head surface is prevented from the contamination possibility while stable discharge can be performed.

Description

[Detailed Description of the Invention] The present invention prevents foreign matter from entering the discharge gap between the multi-needle electrode and the recording body, and reduces the sliding frictional resistance with the recording body, thereby improving the stability of the discharge. The present invention relates to an electrostatic recording print head.

As a conventional electrostatic recording print head, for example, there is one shown in FIG. A multi-needle electrode (discharge electrode) 3 arranged so as to have an air gap 2 for corona discharge (dielectric belt, drum, etc.), and an electrode 3 in front and behind the multi-needle electrode 3 (with respect to the moving direction of the recording medium 1). f[ttl III electrode 4, which is arranged at a predetermined interval and to which a predetermined direct current pressure is applied;
It is composed of a spacer 5 that forms a .

In this electrostatic recording print head, when forming the spacer 5, the stylus 3 and the control electrode 4 are fixed with resin 6, etc., and then the surface of the stylus 3 is attached with adhesive as shown in FIG. After masking with adhesive tape 7 and coating the entire surface of the recording head with Teflon resin 5a or the like to a thickness of 5 to 10 μm as shown in FIG. By peeling off the adhesive tape 7 and polishing the coated surface as shown in C), the spacer 5 is
Suginari.

In the above configuration, when a voltage corresponding to recording information is applied to the arrayed multi-needle electrodes 3 and a bias voltage is applied to the control electrode 4, a corona discharge is caused by the multi-needle electrode 3 on the recording medium 1. An electric latent image can be generated on the recording medium 1.

However, since the conventional electrostatic recording print head has an air gap 2 on the head surface, if dust enters the gap 2 and degrades the discharge characteristics, there is a risk of missing dots. Due to the existence of the gap 2, the friction with the recording medium 1 increases, and there is a possibility that the discharge characteristics will fluctuate due to wear.

The present invention has been made in view of the above, and is a member that transmits electrons during discharge between a multi-needle electrode and a recording medium by creating an air gap for discharge in order to prevent a decrease in discharge characteristics or a fluctuation in discharge characteristics. The present invention provides an electrostatic recording print head that is closed with a .

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

FIG. 3 shows an embodiment of the present invention, and the same parts as in FIG. The structure is different from that shown in FIG. 1 in that it is coated with a chemical substance 1o. There is an air (or vacuum, other gas, etc.) gap 11 (several microns) between the anisotropically conductive material 10 and the surface of the multineedle electrode 30.
m N, , , ) are formed.

As shown in FIG. 4, the anisotropic conductive material 10 is constructed by embedding a large number of conductive needles 13 in a dielectric material 12 perpendicularly to the surface of the recording medium.

The needle 13 is, for example, 1 square tan hit, D100~Zoo, 0
The number should be around 00.

In the above configuration, when a negative voltage (for example, -300V) is applied to the multi-needle electrode 3 according to the recorded information, as shown in FIG. The electrons collide with the electrons 14, and the recording medium 1 directly below is charged through the tip 13 at the position closest to the electrons 14, forming an electrostatic latent image. Since the entire head surface is flattened by the anisotropically conductive material 10, the sliding friction against the recording medium 1 is much smaller than in the past, and there is no risk of the surface becoming dirty.

If it is difficult to cover only the air gap 2 with the anisotropically conductive material 10, the entire end face may be covered with the anisotropically conductive material 10, as shown in FIG. .

FIG. 6 shows an example of a recording device using the electrostatic recording print head 100 of the present invention shown in FIG. This is a system that forms an electrostatic latent image using a recording print head 100. A recording belt 21 in which a recording body is formed by sequentially providing a base mylar, a resistive layer, and a dielectric layer on the surface of the belt, and an electrostatic recording print head 100 that is provided so as to be able to come into contact with the surface of the recording belt 21. , recording belt 21
a motor 23 that drives the roller 222; a developer 24 that deposits toner on the surface of the recording belt 21 according to the charge on the surface of the recording belt 21; (plain paper) 25; a cleaner 27 that removes the toner adhering to the surface of the belt 21 after the transfer; An erase corotron 28 that removes electric charges, and a fixing device 29 that fixes prints and images transferred to the recording paper 25.
, a drive circuit 30 that applies a recording voltage to the needle electrode 3 of the electrostatic recording print head 100 and a bias voltage to the control electrode, and a control section 31 that controls the drive circuit 30 and the roller 22. be done.

In the above configuration, when a recording voltage is applied to the needle electrode 3 of the electrostatic recording print head 100 by the drive circuit 3 Qq in response to a recording signal from, for example, a facsimile, the control unit 3
As the motor 23 driven by the dielectric belt 1 rotates the dielectric belt 21, an electrostatic latent image is formed on the recording medium. This latent image is developed with toner by a developing device 24 and transferred onto a recording paper 25 by a transfer corotron 26. The transferred toner image is fixed by a fixing device 29 to obtain a recorded image. On the other hand, after residual toner is removed from the recording belt 21 by a cleaner 27, the latent image is erased by an erase corotron 28.

As described above, according to the electrostatic recording print head of the present invention, the end face of the head is coated with an anisotropically conductive material to prevent foreign matter from entering between the multi-needle electrode and the recording medium, and By making the head surface flat, dirt is less likely to adhere to it and a constant gap is always maintained, which improves the stability of discharge. In addition, since the end surface is flat, friction is reduced and head touch is improved, and a medium that can be cleaned with a solvent can be used on the end surface. Furthermore, different discharge characteristics can be selected by creating a vacuum or filling the gap with other gas.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional electrostatic recording print head. FIGS. 2(&), (b), and (e) are explanatory diagrams showing the process of forming a conventional spacer. FIG. 3 is a perspective view showing an embodiment of the present invention. FIG. 4 shows an anisotropically conductive material 10 according to the present invention.
A perspective view of. FIG. 5 is an explanatory diagram of the operation of the embodiment of the present invention. 6th
The figure is a configuration diagram showing an example of a recording device using the electrostatic recording print head of the present invention. FIG. 7 is a sectional view showing another embodiment of the present invention. Explanation of symbols 3...Multi-needle electrode, 4...Control electrode, 5...Spacer, 10...Anisotropic conductive material, 2.11...Gap, 12...Insulator, 13 ...conductive needle. Patent applicant: Fuji Xerox Co., Ltd. Agent: Nobuyuki Matsubara, patent attorney

Claims (1)

[Scope of Claims] An electrostatic recording print head comprising a row-shaped multi-needle electrode to which a voltage is applied according to recorded information, and a spacer forming a discharge gap on a head surface facing a recording medium, comprising: A print head for electrostatic recording, wherein an opening of the gap is closed by an electron transfer member that transfers electrons between the multi-needle electrode and the recording medium.