JPH03230969A - Electrostatic recorder - Google Patents

Abstract

PURPOSE:To make formation of ions sharp by a method wherein an ion flow control means is formed with a plurality of control electrodes arranged on a slit side surface of an insulating substrate, the slit side surface and an opposite side surface of the insulating substrate being coated by a conductive coating and besides, the conductive coating is connected to each potential. CONSTITUTION:When high voltage is impressed to a discharge wire 20 from a wire power source 40, an ion is generated in a chamber 18. Then, by blowing an air flow A into the chamber 18 from above the chamber 18, the ion in the chamber 18 is applied onto an electrostatic latent image acceptor 12 through a slit 30 provided to communicate with the chamber 18. By impressing voltage corresponding to an image signal to each control electrode 34 from a control circuit 44, the ion flow passing through the slit 30 is controlled to be charged onto the electrostatic latent image acceptor 12, and an electrostatic latent image is formed. When the ion is charged by adhering onto a charge receptor 36 of the electrostatic latent image acceptor 12, a slit side surface and an opposite side surface of an insulating substrate 28 are coated by a conductive coating 46. Since the conductive coating 46 is earthed to an earthing part 48, the insulating substrate 28 is not unequally charged and lines of electric force point just downward.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electrostatic recording device, and more specifically, it controls the amount of ions to uniformly charge an electrostatic latent image receptor, thereby increasing the electrostatic potential. The present invention relates to an electrostatic recording device that can obtain high-quality images.

[Prior Art] Generally, as a recording device that forms an electrostatic latent image on a recording medium, an ion flow control recording device as disclosed in Japanese Unexamined Patent Publication No. 190854/1982 is known.

As shown in FIGS. 4 and 5, this ion flow control recording apparatus includes a recording head a for controlling the ion flow, which irradiates while controlling the ion flow, and a recording head a, which charges the ions irradiated from the recording head a. It consists of an electrostatic latent image receptor medium.

In this case, the recording head a forms a cylindrical chamber e between a pair of grounded conductive shields c and d, and a discharge wire f runs along the longitudinal direction within the chamber e.
An insulating substrate j is attached to the lower part of one shield d so as to cover the shields c and d via an insulating layer and a conductive substrate i, and an insulating substrate j is attached to the lower part of one shield d so as to cover the shields c and d. An ion flow deriving section I is formed between the shield C and the insulating substrate j by a slit k communicating with the ion generating means g.
It is formed by forming. A plurality of control electrodes m are disposed on the side surface of the slit of the insulating substrate j to constitute an ion flow control means for controlling the extraction of the ion flow.

Further, an electrostatic latent image receptor that charges ions irradiated from the recording head a is connected to a high potential source 0 on the back side of the charge receptor n, that is, on the opposite side of the charge receptor n to the surface facing the recording head a. It has a structure in which a back electrode p is provided.

In the electrostatic recording device configured as described above, ions are generated in the chamber e by applying a high voltage from the wire power supply q to the discharge wire f, and an air flow is created in the chamber e from above the chamber e. By blowing in A, the ions in the chamber e can be attached and charged to the electrostatic latent image receptor through the slit k provided in communication with the chamber e. At this time, by applying a voltage according to the image signal from the control circuit r to each control electrode m,
An electrostatic latent image can be formed by controlling the flow of ions passing through the slit k to charge the electrostatic latent image receptor.

[Problems to be Solved by the Invention] However, in this type of conventional recording device, since the insulating substrate j is made of glass, the portion of the insulating substrate j near the ion outflow port comes out from the slit k. The line of electric force is disturbed by being non-uniformly charged by ions, and since the part far from the ion outlet acts as an insulator, a phenomenon occurs in which the line of electric force does not point directly downward (see Figure 5).

Therefore, in this type of conventional electrostatic recording device,
There is a problem in that the latent image on the electrostatic latent image receptor spreads, causing image disturbance, and as a result, it is impossible to obtain a high-quality image.

This invention was made in view of the above-mentioned circumstances, and in order to solve the above-mentioned problems, it is possible to prevent the disturbance of electric lines of force due to non-uniform charging of ions on the insulating substrate of the recording head, and to The object of the present invention is to provide an electrostatic recording device that sharpens the formation of ions on the surface of the surface of the surface of the image, thereby making it possible to obtain high-quality images without image disturbance.

[Means for Solving the Problems] In order to achieve the above object, the electrostatic recording device of the present invention includes an ion generating means, a communication means with the ion generating means, and an ion flow generated by the ion generating means. Electrostatic recording comprising: a recording head comprising an ion flow derivation section for controlling the ion flow, and an ion flow control means for controlling the ion flow derivation; and an electrostatic latent image receptor disposed opposite to the ion flow derivation section. Assuming that the ion flow guiding part is composed of a reference electrode surface and an insulating substrate arranged to face each other to form a slit, the ion flow control means is arranged on a side surface of the slit of the insulating substrate. It is characterized in that it is formed of a plurality of control electrodes provided, a conductive film is coated on the opposite side of the slit side of the insulating substrate, and the conductive film is set at a ground potential.

In this invention, the conductive film may be coated in any form such as vapor deposition or coating as long as it covers the side surface opposite to the slit side surface of the insulating substrate. It is sufficient that at least the surface near the exit side of the slit is coated. In this case, a metal such as aluminum can be used as the conductive film.

[Effect] The above technical means works as follows.

With the above configuration, when the ions generated by the ion generating means pass through the slit by the air flow, they are controlled by the control means in accordance with a predetermined image signal, and the electrostatic latent image receptor is charged. be done.

In this case, by coating the side surface of the insulating substrate opposite to the slit side surface with a conductive film, and by setting the conductive film at ground potential, the ions coming out of the slit will not uniformly charge the insulating substrate. Since the lines of electric force can be directed directly onto the electrostatic latent image receptor directly below, the ions do not spread and are sharply charged onto the electrostatic latent image receptor.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a cross-sectional perspective view of a recording head in an electrostatic recording apparatus of the present invention, and FIG. 2 is a cross-sectional view of essential parts of the electrostatic recording apparatus.

The electrostatic latent image recording device of the present invention includes a recording head 10 for controlling ion flow, which irradiates while controlling the ion flow, and an electrostatic latent image receptor, which is a recording medium that charges the ions irradiated from the recording head 10. The main part consists of 12.

The recording head 10 includes a pair of grounded conductive shields 1.
4. Forming a cylindrical chamber 18 between 16 and
A discharge wire 20 is stretched along the longitudinal direction in this chamber 18 to form an ion generating means 22, and an insulating layer 24 and a conductive substrate 26 are provided under one shield 16.
Insulating substrate 2 to cover shield 14.16 through
8 is attached, and an ion flow lead-out section 32 is formed between the other shield 14 (reference electrode) and the insulating substrate 28 with a slit 30 that communicates with the ion generating means 22. A plurality of control electrodes 34 connected to the conductive substrate 26 are arranged on the side surface of the slit of the insulating substrate 28 to constitute an ion flow control means for controlling the extraction of the ion flow.

Further, a conductive coating 46 formed of a metal such as aluminum on the side surface of the insulating substrate 28 opposite to the slit side surface.
is coated by vapor deposition or the like, and this conductive coating 46 is grounded to a ground portion 48 .

On the other hand, an electrostatic latent image receptor 12 that charges ions irradiated from the recording head 10 is connected to a high potential source 42 on the back side of the charge receptor 36, that is, on the opposite side of the charge receptor 36 to the surface facing the recording head 10. It has a structure in which a back electrode 38 is provided.

In addition, in FIG. 2, the symbol B indicates the moving direction of the charge receptor 36.

In the electrostatic recording device configured as described above, when a high voltage is applied from the wire power source 40 to the discharge wire 20,
Ions are generated in the chamber 18, and by blowing an air flow A into the chamber 18 from above the chamber 18, the ions in the chamber 18 pass through the slit 30 provided in communication with the chamber 18 and are transferred to the electrostatic latent. image receptor 1
2. At this time, by applying a voltage according to the image signal from the control circuit 44 to each control electrode 34, the ion flow passing through the slit 30 is controlled, and the electrostatic latent image receptor 12 is charged, and the electrostatic latent image receptor 12 is charged. A latent image is formed.

When ions are attached and charged on the charge converter 36 of the electrostatic latent image receptor 12 as described above, the conductive coating 46 is coated on the side surface of the insulating substrate 28 opposite to the slit side surface, and the conductive coating 46 is 46 is grounded to the ground portion 48, so that the insulating substrate 28 is not unevenly charged.
The electric lines of force point directly below (see Figure 2).

Therefore, the ions are attached to and charged on the charge receptor 36 without spreading, and the charge receptor 36 moves in the direction of arrow B, and the developer is attached to the charged portion of the charge receptor 36 in a developing section (not shown). The image is transferred to a recording sheet (not shown) in a transfer section.

Next, a line image comparison test between the recording head 10 of the electrostatic recording apparatus of the present invention and the conventional recording head a will be described.

During the test, ■The line image is the charge receptor 36. Movement amount of n 0゜5mm
Minute recording head 10. A latent image is written in a, and developed using an electrophotographic method. ■Recording head 10. The total amount of ions emitted from a is calculated from both heads 1
0. The same conditions were used for both a and (2) For comparison of line images, the image density was measured and its half width was measured.

As a result of testing under the above conditions, as shown in Figure 3, the line width of the conventional recording head a was 0.60 mm, and the thickness was +20% compared to the 0.5 mm line. On the other hand, the line width of the recording head 10 according to the present invention was 0.55 mm, and the amount of thickening was +10% with respect to the line width of 0.5 mm, and the amount of thickening could be reduced by 10%. Furthermore, in the recording head 10 according to the present invention, the edges of the image were sharper than in the conventional recording head a, and a clear image could be obtained.

[Effects of the Invention] As explained above, since the electrostatic recording device of the present invention is configured as described above, the following effects can be obtained.

1) Since the conductive film is coated on the opposite side of the slit side of the insulating substrate and the conductive film is set to the ground potential, the insulating substrate will not be unevenly charged and will not receive electrostatic latent images. It is possible to sharply charge ions onto the body.

2) Since ions are sharply charged on the electrostatic latent image receptor, image disturbance can be prevented and high quality images can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional perspective view of a recording head in an electrostatic recording device of this invention, FIG. 2 is a sectional view of essential parts of an electrostatic recording device of this invention, and FIG. 3 is a recording head of this invention and a conventional recording head. A graph showing the relationship between optical density and line image width,
FIG. 4 is a cross-sectional perspective view of a conventional recording head, and FIG. 5 is a cross-sectional view of essential parts of a conventional electrostatic recording device. Description of symbols (10) (12) (14) (22) (28) (30) (32) (34) (44) (46) (48) ... Recording head ... Electrostatic latent image receptor ... ...Shield (reference electrode) ...Ion generation means ...Insulating substrate ...Slit ...Ion flow extraction section ...Control electrode (ion flow control means) ...Control circuit ...Conductivity Sex film...Earth part

Claims (1)

[Claims] (1) Consisting of an ion generation means, an ion flow derivation section communicating with the ion generation means and for deriving the ion flow generated by the ion generation means, and an ion flow control means for controlling the derivation of the ion flow. In an electrostatic recording device comprising a recording head and an electrostatic latent image receptor disposed opposite to the ion flow derivation section, the ion flow derivation section may be connected to a reference electrode surface disposed opposite to form a slit. , an insulating substrate, the ion flow control means is formed by a plurality of control electrodes arranged on the side surface of the slit of the insulating substrate, and a conductive electrode is formed on the side surface of the insulating substrate opposite to the slit side surface. An electrostatic recording device characterized by being coated with a film and having a conductive film at ground potential.