JPS603186B2 - Electrostatic image amplification recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrostatic recording method in which the recording control voltage is a low voltage (50 volts or less) and the distance between the electrostatic latent image writing part and the part to be written is large (one side The present invention relates to an electrostatic image amplification type recording method that enables high-speed recording.

FIG. 1 is a schematic diagram of an apparatus for explaining an example of a conventional electrostatic recording method, in which 1 is a corona generator, 2 is a control electrode, 3 is a recording paper, and 4 is a back electrode.

In this operation, recording was performed by controlling the corona flow from the corona generator 1 with the control electrode 2 to create a static latent image on the recording paper 3, and then developing and fixing the image.
In this case, the recording control voltage applied to the control electrode 2 is several 10
It has the advantage that it requires only a low voltage of volts, and the distance between the control electrode 2 and the recording paper 3 can be more than 1 Yanagi, but the corona flow exposure density is low, so the recording speed is only 0.67 seconds.
It had the disadvantage that only EC could be obtained (this conventional example is referred to in the literature, Kubota, Miyoshi: Study of facsimile receiver using ion flow electrostatic recording, Proceedings of the 5th National Conference of the Institute of Image Electronics Engineers, No. 14). (see 1977). FIG. 2 is a schematic diagram showing another conventional example, in which reference numeral 11 indicates a cleaning section, and 12
1 is a corona charger, 13 is a latent image forming pin, 14 is a developing device, and 15 is a dielectric drum. In this operation, the dielectric drum 15 is uniformly charged by the corona charger 12, the charge on the transfer drum 15 is removed from the latent image forming pin electrode 131 in response to a recording signal, and then the charge is reversely developed. transcription,
Recording was performed by fixing.

According to this method, high-speed recording is possible on recording paper, but it is necessary to apply a high voltage pulse (several 100 volts) to the latent image forming pin electrode 13, and the latent image forming pin electrode 13 The distance from the dielectric drum 15 is 20 to 30
Furthermore, if the latent image forming pin electrode 13 becomes dirty, it will be discharged by high voltage and the recording will become unstable. Aikawa, Horie, Formation of latent image using non-contact pin electrodes on the display drum, 1971 Yodo Institute of Electronics and Communication Engineers General Conference National Convention Paper Tsukiji.5, 197 (reference).

Figures 8 and 9 use a conventional photoreceptor mesh with conductive treatment on one side, and the electrostatic latent image created on the photoreceptor mesh controls the corona ion flow, allowing development onto a recording medium. 1 is a schematic diagram of an apparatus for forming an electrostatic latent image. FIG. 8 shows a conventional example of a copying machine, in which 41 is an exposure system, 42 is a photoreceptor mesh, 43 and 44 are corona generators, and when used as a printer, a laser or other device is used instead of the exposure system 41. A static latent image is formed on the photoreceptor mesh 42 using an optical writing system.

Reference numeral 45 denotes a transfer drum, and since the structure of this part is the same as that of the dielectric drum 28 in FIG. 3, a description thereof will be omitted.

(For this subsidiary example, U.S. Patent No. 4006 No. 3
(see specification). Next, Figure 9 shows a conventional example of a printer.
1 is a belt-shaped photoreceptor mesh, 52 is electrostatic recording paper, 5
3 and 54 are corona generators, 55 is a developer, 56 is a heater, 57 is a fixing device, and 58 is an optical writing system. In this case as well, in order to form a static fin latent image on the photoreceptor mesh 51,
An optical writing system 58 such as a laser is required.
(See 7th trial). The two examples shown in Figures 8 and 9 above both use a photoreceptor with conductive treatment on one side as the photoreceptor mesh, so the adjustment of the laser light source, modulator, lens system, etc. is complicated to form an electrostatic latent image. It requires an optical system, and the photoreceptor itself.
It has disadvantages such as deterioration in chargeability and short lifespan compared to other dielectric materials such as polyester. This invention is
In view of the above points, a dielectric film with one side treated as a conductive surface is used, and a corona flow corresponding to the recording signal is applied to the dielectric surface of the dielectric film for a short period of time to create a weak static latent image. is written, and then a corona flow is applied for a long time from the conductive treated surface to create an electrostatic port image, thereby forming a desired recorded image on the recording paper.

This invention will be explained in detail below. FIG. 3 shows a schematic configuration diagram showing one embodiment of the present invention, and FIGS. 4a and 4b show a perspective view and a partially enlarged view of the dielectric seal shown in FIG. 3.

In these figures, reference numeral 21 denotes a conductive plate, and one side of a dielectric body 22 is subjected to a conductive treatment to form a conductive treated surface 23.

As shown in FIG. 4a, the conductive mesh 21 is formed by forming a large number of meshes (avertures) 22a at a predetermined pitch on the outer peripheral surface of a cylindrical dielectric 22. Therefore, the conductive treatment surface 23 also has a mesh shape. 2
4 is a corona generator with mesh for charging, 25 is a corona flow pulse generator for writing, 26 is a back electrode, 27 is a corona generator, 28 is a dielectric drum, 29 is a developing device, 30 is a back electrode, 31 is a cleaning part, 32 is a corona charger,
33 is a transfer corona generator, 34 is a recording paper, and 35 is a fixing device.

Next, this operation will be explained.

A corona generator 24 with a charging mesh charges the dielectric film 21 to a point through which a corona flow for forming a static latent image cannot pass. Next, the electric charge near the aperture corresponding to the dot to be recorded is neutralized by the writing corona flow pulse generator 25. Next, a corona flow is applied by a corona generator 27 from the conductor treated surface 23 side of the dielectric seal 21. Then, the corona flow cannot pass through the mesh portion that has not been neutralized by the write corona flow pulse generator 25, while the corona flow can pass through the neutralized mesh portion, thereby causing the aforementioned information to be recorded. A static latent image corresponding to the dots is formed on the exposure drum 28. Thereafter, the image is developed by the developing device 29, and the image is developed by the transfer corona generator 33.
The toner image is transferred to the recording paper 34, and finally fixed by the fixing device 35 for recording. FIG. 5 is a partially enlarged view showing another embodiment of the dielectric wrapper, in which conductive treatment 23' is individually applied to the periphery of each mesh 22b on the surface opposite to the conductive treatment surface 23 of the dielectric 22. .

In this case, each mesh 22b is insulated. Now, the principle by which the corona flow is controlled by the dielectric shield 21 having the conductive treated surface 23 formed on one side thereof will be explained with reference to FIGS. 6a and 6b.

6a shows a state in which no corona flow flows (FIG. 6b shows a state in which a corona flow flows. In the state shown in FIG. 6a, the dielectric 22
Due to the above charge, the corona flow is subjected to a repulsive force and cannot pass through the aperture, but is absorbed by the turtle-guiding treated surface 23. On the other hand, in the state shown in FIG. 6b, the writing corona flow pulse generator 2 shown in FIG.
Since the mesh corresponding to the dots to be recorded has already been neutralized by the corona flow from 7, the corona flow from the corona generator 27 for forming a static latent image can pass through and A static latent image is formed according to the recording signal. In addition, if a dielectric tush as shown in FIG. 5 is used, it is possible to control the corona flow more stably.
Electrostatic recording is performed using such a mechanism, but the following experiment was conducted to find the speed limit of this method. This will be explained below. Now, the charge density on the dielectric wrapper 21 is the ratio of the hole of the mesh 22a to the thickness of the dielectric 22 = 1.5:1. The relationship between this and the corona flow 1 passing through the desired mesh 22a of the dielectric seal 21 is shown in FIG. In Europe 7, the problem is the rate of change due to changes in the amount of charge on the corona flow electromechanical mesh 21.

In other words, if the difference △2 between the change in the charge density written by the writing corona flow pulse generator 25 and the change in the charge density on the dielectric drum 28 is found by linear approximation, △z: △T
．． Law・i・△t….・．． ．． ... becomes [1}.

However, △T is from the corona generator 27 to the dielectric drum 28
The time during which the corona flow is flowing above, i is the current density flowing from the writing corona flow pulse generator 25 into the dielectric shield 21, and Δt is the pulse width of the writing corona flow pulse generator 25. .

Fig. 7 If it is possible to strand the thread 34xl 1/Sec for about 1 second, △T and lsec, and the general corona flow density is 2×
Since 10-6 Amp' position can be obtained, 132 x 10-
6Amp' Tomitsuru.

Since the difference in charge level required for development is approximately 6.times.10@-8 coulombs/me, this is substituted into equation '11 to obtain .DELTA.t=10 sec. Therefore, the pulse writing time is 10
It can be seen that the order of mountain Sec is sufficient.

However, since the recording corona flow is saturated at 2×10 −6 Amp/, for example, if the corona generator 27 is designed to have one corona charging region, the limit of the recording speed that can be obtained is as follows. Also, the {11th formula is band=△T・d mother.・．． ．．・．． ．．・．． When transformed into (2), the right side of equation '2) becomes the electrostatic charge amplification factor of the dielectric grid.

In the above embodiment, the dielectric wrapper 21 is formed into a cylindrical shape and an electrostatic image is formed on the dielectric drum 28. However, the present invention is not limited to this. It may be formed into a belt shape or a flat plate shape to form an electrostatic latent image.

Further, in the above embodiment, the conductive treated surface 23 is formed on the dielectric material 22, but the dielectric surface may be formed on a mesh-like conductive material.

Furthermore, the mesh does not necessarily have to correspond to one dot, and can be determined as appropriate. Further, in the above embodiment, an example was described in which recording is performed on the recording paper 34 via the electrostatic drum 28, but the present invention is not limited to this, and it is also possible to record directly on the electrostatic recording paper from the dielectric film 21. Needless to say.

In short, any insulating recording substrate may be used, whether it is a dielectric drum or electrostatic recording paper. As explained above, according to the present invention, it is possible to amplify a electrostatic image by forming a required electrostatic latent image on an insulating recording substrate using a dielectric film having a conductive treatment surface formed on one side. High voltage is not required for recording control voltage;
In addition, it is possible to maintain a sufficient distance between the dielectric film and the insulating recording substrate, and since no photoreceptor is used, there is no need for an optical system to write the electrostatic latent image on the dielectric film. It has many advantages such as the recording process can be performed electrically, the life of the dielectric film is long, and high-speed recording is possible because the electrostatic charge image is amplified as mentioned above. be.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an apparatus for explaining a conventional electrostatic recording method, Fig. 2 is a schematic diagram of the same apparatus showing other subsystems, and Fig. 3 is an electrostatic recording apparatus showing an embodiment of the present invention. A schematic configuration diagram of the apparatus for explaining the recording method, FIGS. 4a and 4b are partial perspective views and partially enlarged views showing details of the dielectric seal shown in FIG. 3, and FIG. Fig. 6a and b are partially enlarged views showing the operating principle of the dielectric film, Fig. 7 is a diagram showing the relationship between corona flow and mesh charge density, and Figs. 8 and 9. are schematic diagrams for explaining conventional devices, respectively. In the figure, 21 is a dielectric film, 22 is a conductor, 23 is a conductor treated surface, 24 is a corona generator with a charging mesh, 2
5 is a writing corona flow pulse generator, 26 is a back electrode, 2
7 is a corona flow generator, 28 is a dielectric drum, 29 is a developing device, 30 is a back electrode, 33 is a transfer corona generator, 3
4 is recording paper, and 35 is a fixing device. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure T Figure 8 Figure 9

Claims (1)

[Claims] 1 Using a dielectric mesh with one side treated as a conductive surface, a charge distribution corresponding to the recording signal is created by controlling the corona flow on the dielectric side of the dielectric mesh, and then,
Applying a corona flow from the conductive treated side of the dielectric mesh,
By controlling this corona flow by the charge distribution on the dielectric mesh, an electrostatic latent image having a charge distribution amplified compared to the charge distribution on the dielectric mesh is created on the insulating recording substrate. An electrostatic image amplification type recording method characterized by recording using an electrostatic latent image.